Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b54d99286a10346…

MALICIOUS

PDF

106.0 KB Created: 2021-05-30 00:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d0053755436c1d95ca4ca4368e5e2a78 SHA-1: e751b93c0fa39ddfc8236a560e164ac5fbe977e5 SHA-256: 0b54d99286a103461c625c6c66e1b30769d6aa924f8976a83be527935020c95a
214 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with a critical heuristic identifying it as a malicious redirector link farm. The primary malicious URL identified is https://dafemum.ru/strik. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution through these links. No scripts were extracted, but the PDF structure itself is weaponized to lead users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=why+catcher+in+the+rye+banned In PDF document text
    • https://cdn-cms.f-static.net/uploads/4482027/normal_600ae499cba95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402717/normal_5fe3133027040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471114/normal_60288ef6583ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470836/normal_604710538a832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417039/normal_60481e1384045.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454543/normal_6038c8da357a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390681/normal_600bb78223182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495265/normal_60183874a2860.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425919/normal_6041c10a05550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371514/normal_602d2c021610f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_606dd5688f23f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376866/normal_60559cc0dc242.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459468/normal_5fe563129f59f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421048/normal_605ef6bcebbdc.pdfIn PDF document text
    • https://japapitamamevoj.weebly.com/uploads/1/3/2/7/132740309/dd97c.pdfIn PDF document text
    • https://kuxadolawemigos.weebly.com/uploads/1/3/4/7/134712866/0e0cb386a5.pdfIn PDF document text
    • https://vunamesu.weebly.com/uploads/1/3/5/3/135324142/4846575.pdfIn PDF document text
    • https://mogisitubetaw.weebly.com/uploads/1/3/4/4/134496388/dipemu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e52c9aab-89ba-4a35-b2c4-fbfa39ad63c3/ham_radio_deluxe_free_alternative.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ebb422d-f98d-48f3-8b20-ed9a459a1df0/29980865820.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000157b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157B6 4752 bytes
SHA-256: 035ed830acaf7e2d268bbbcd634b5a326cad4f3d9a4edf11d5338277b8ff5c06
font_01_sfnt_off000167d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167D3 10452 bytes
SHA-256: ed1dc6d35ae02c8b6c3ae99bb440fe0fe171477b171fd6c6a590399fe7568f58
font_02_sfnt_off00018b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B55 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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