Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d8590cd9530308…

MALICIOUS

PDF

152.0 KB Created: 2021-06-10 20:07:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d1342f1949cfaa01a785d095cbf145f6 SHA-1: 6a5bbe4faa7e5b0b67efddd2c734818531ffddba SHA-256: 95d8590cd9530308cb3d4ed690893dc9b9b238b834616ef887d7fbbc4530f7e8
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm or phishing attempt. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The primary attack vector appears to be directing users to external URLs, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://smidgel.ru/pbw?utm_term=surah+yaseen+tafseer+in+tamil PDF link annotation
    • https://wekupadafar.weebly.com/uploads/1/3/5/3/135315244/2b9b9cf9f9c484.pdfIn PDF document text
    • https://wivapofeselaf.weebly.com/uploads/1/3/5/3/135317026/a72aa319e34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402294/normal_6010ff51cd0e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497071/normal_603611d2a1d87.pdfIn PDF document text
    • https://juzasofudabin.weebly.com/uploads/1/3/0/7/130775050/puselowa-dekejowivomoxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393625/normal_6012441345194.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381091/normal_60480bd7a4795.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369764/normal_5fc9b3ca10729.pdfIn PDF document text
    • https://saguwaxofules.weebly.com/uploads/1/3/2/6/132681351/lalugaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_60b9e8293eee2.pdfIn PDF document text
    • https://vatewiwep.weebly.com/uploads/1/3/4/4/134482367/1320064.pdfIn PDF document text
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/5ff69.pdfIn PDF document text
    • https://likiroji.weebly.com/uploads/1/3/4/5/134526819/kexosidir_zefinonumaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_605c30726e06d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480904/normal_602c95fb6c5e8.pdfIn PDF document text
    • https://dekodisiga.weebly.com/uploads/1/3/6/0/136051758/2892488.pdfIn PDF document text
    • https://dozogifelezu.weebly.com/uploads/1/3/4/3/134313369/jezime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370540/normal_605bcc589e26e.pdfIn PDF document text
    • https://xukaxibuban.weebly.com/uploads/1/3/4/7/134701669/jixobabudejin.pdfIn PDF document text
    • https://sabigakubotel.weebly.com/uploads/1/3/2/7/132740275/jizusiwavij_budaxavaliwuj_vezanalidex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404515/normal_5fc6798211ba6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415929/normal_606e243bd1915.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470412/normal_5ff4f4826ddc4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off000224bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x224BB 24204 bytes
SHA-256: 98e42293bef2e9dbf0be4bc2698da5a5ac933239f8dd3b090019e43107ebff8e
font_00_sfnt_off0001a042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A042 3212 bytes
SHA-256: 3136bd705179b7b524518c34a2bf3ad8905952ed488fed46c897c3c991964c86
font_01_sfnt_off0001abc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1ABC3 5212 bytes
SHA-256: 6e1406df9599bab3dbb5d9a04612eabbbb4244951ef7e8ba0cbb0a6442fb09a6
font_02_sfnt_off0001bd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD56 18936 bytes
SHA-256: d54247709bbcae893a6878496c3349cb86220adb07d30ba7535d3a71cfabdb8f
font_03_sfnt_off0001e5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E5F5 6584 bytes
SHA-256: 9528611888f00de16ee8586e63e834fa786485a820b8a8e414865ac833cbef8d
font_04_sfnt_off0001fb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FB02 12240 bytes
SHA-256: f69b19355cd52ed559d5942827f844f5743cc013c732db444ed25eb497a2d7c8

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