Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51cbce838869604…

MALICIOUS

PDF

74.6 KB Created: 2021-06-06 17:39:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 810b5cc0f457bb014c66d4e1bcc0fadc SHA-1: 505713ca43c710b5eed1088d9ec123d600657b34 SHA-256: f51cbce838869604f1a6ca4ba775ce8e9c2aed79e65c3f085d082bad1aa9878b
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to obscure the ultimate malicious destination. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs points towards an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • 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://philabc.ru/pbw?utm_term=rapidex+spoken+english+tamil+book+free+download+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370278/normal_604ec7fbedc0f.pdfIn PDF document text
    • https://laripevomed.weebly.com/uploads/1/3/4/2/134266376/sitajod_rakajadisi_sonijoguteme_kisulexipiwib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417659/normal_604b61b272515.pdfIn PDF document text
    • https://dovavifedudefew.weebly.com/uploads/1/3/2/7/132710721/xavimilalepub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466143/normal_6064f4ee9bb9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457570/normal_602d9536141a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376850/normal_5fea4484d7bc4.pdfIn PDF document text
    • https://dulewexafup.weebly.com/uploads/1/3/4/7/134702005/rusupuxazozire.pdfIn PDF document text
    • https://rebusisi.weebly.com/uploads/1/3/4/0/134017700/7930289.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427529/normal_5ffcefcb1478a.pdfIn PDF document text
    • https://vowufesoval.weebly.com/uploads/1/3/4/8/134885018/ce3ed01eab308c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414680/normal_5fd147bfbd3f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465565/normal_605af18581f16.pdfIn PDF document text
    • https://pakipuxis.weebly.com/uploads/1/3/5/3/135347710/9814783.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463263/normal_6052fedfbb5f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505820/normal_604a56535a359.pdfIn PDF document text
    • https://baxorejo.weebly.com/uploads/1/3/5/2/135295822/2207648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491436/normal_60bb020496d66.pdfIn PDF document text
    • https://fewarixavaj.weebly.com/uploads/1/3/4/8/134847043/6269067.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fokojifidesi.pbworks.com/w/file/fetch/144514545/89961779865.pdfIn PDF document text
    • http://midevodimu.pbworks.com/w/file/fetch/144680382/shaadi_me_zaroor_aana_full_movie_download_moviescounter.pdfIn PDF document text
    • http://bowawesup.pbworks.com/w/file/fetch/144535065/suicide_squad_full_movie_download_in_hindi_ipagal.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/40031736624.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/w/file/fetch/144717558/keune_hair_color_good_or_bad.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE473 5828 bytes
SHA-256: 510a74c80a14715a41d0954f08f68d8fac9fab3820177b3655f4b86454886005
font_01_sfnt_off0000f835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 10600 bytes
SHA-256: 61c86343c1d4001f80585b590f10dd9a230ff41fcc380978889a79b4693fcc87

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