Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1b71252f707973d…

MALICIOUS

PDF

108.3 KB Created: 2021-03-07 13:57:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: b9c2bb4d524beea0f0a49a57316feda8 SHA-1: 00c73e7b80531001f668d5d01d276e414d576cc4 SHA-256: c1b71252f707973d4bfacc023972600499dbbd16efbcb786545b6049f871cc92
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to disposable hosting, indicating a link farm or SEO abuse tactic. One prominent URL, 'https://soxebez.ru/strik?utm_term=chuunibyou+demo+koi+ga+shitai+ep+3+bg+subs', is flagged as unknown reputation, suggesting a potential malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://soxebez.ru/strik?utm_term=chuunibyou+demo+koi+ga+shitai+ep+3+bg+subs PDF link annotation
    • https://benodamefeju.weebly.com/uploads/1/3/5/3/135346815/jewiludikuvatafov.pdfIn PDF document text
    • https://pirizujimo.weebly.com/uploads/1/3/4/4/134454944/4fbc0b.pdfIn PDF document text
    • https://tijotado.weebly.com/uploads/1/3/1/3/131382447/mikopigedu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://pubitawiwinas.rf.gd/jopinuna.pdfIn PDF document text
    • https://b3a8b944-ddec-4d17-9b53-5a1c05c66d8c.filesusr.com/ugd/314503_d0f8ec32e18d4f4c989c75c8508a2802.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e382b134-e277-4cbc-9701-a352f5309625/the_kingdom_of_god_is_within_you_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/assam_tet_exam_guide_book.pdfIn PDF document text
    • https://0f8fedcd-12c0-4678-86f8-e2bff7269121.filesusr.com/ugd/70e7d4_677e870d65af4ed69f56b33a1c73c5a4.pdf?index=trueIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_2440602990d84e2584fc69fb222bf2e8.pdf?index=trueIn PDF document text
    • https://15319a82-8c66-4906-b3c2-464277991f2b.filesusr.com/ugd/070acf_9ca993c6f80f42ef8067d7bbc2fe25c4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tapelu/basic_english_grammar_azar.pdfIn PDF document text
    • http://vuzabog.epizy.com/gelozuvinufotezapelevofa.pdfIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_880af5d209984e8aa876eb5bc4a4dc27.pdf?index=trueIn PDF document text
    • https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_5faa8201ed5642a2839bce811acffc26.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee7bbb40-a95b-4f0e-9b50-f73edfc86b9a/omron_blood_pressure_monitor_hem-432cn2.pdfIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_4febcf78241147b0a4a7bb2331522e21.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/20123997164.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/36332493809.pdfIn 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.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off000174eb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x174EB 25596 bytes
SHA-256: eecb9d65568ea339d77785a3a8ca76d9c1773bab54baeae30a584a566132c800
font_00_sfnt_off00010661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10661 8060 bytes
SHA-256: 1ccfed400ec96bd36c36579dd969d701ddaec72e130b7edda9260e4fd55d368d
font_01_sfnt_off00012189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12189 5620 bytes
SHA-256: 8f5fe886c61504f73aa8b836925d70c705ace932e5d84945e9662065923687d6
font_02_sfnt_off00013481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13481 7540 bytes
SHA-256: 0ff54cd39bbeb4a7ef71352afff20c035ab19f957d4981ab9851aba9233c9503
font_03_sfnt_off000148e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148E0 14728 bytes
SHA-256: d1786f42e651d137c586004aaaa632abaaf0a1ff5d1417ba181347cac00f2ee3

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