Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d311cc12577dce9…

MALICIOUS

PDF

76.8 KB Created: 2021-05-27 16:46:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d65bcc2b5ccbf7bac4d3b4cfb64529f0 SHA-1: 1111a0e413c6012deaddda2c60c983ceeb26a47b SHA-256: 6d311cc12577dce99b9f30a5a5558a72b20a574ffc5106f07e1bbe68314a437c
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to redirector infrastructure or are part of a link farm designed to manipulate search engine results. The primary link identified directs to 'https://yafferge.ru/strik', which is flagged as a malicious redirector. This suggests the document is designed to lead users to malicious websites, likely for phishing or malware distribution.

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://yafferge.ru/strik?utm_term=how+to+fix+a+tiffany+lamp+shade In PDF document text
    • https://cdn-cms.f-static.net/uploads/4457570/normal_602d94c623c4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463543/normal_5fdbed6168025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466666/normal_602d2fa53374d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452862/normal_5ff09bd65fc64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451368/normal_602b2240cd254.pdfIn PDF document text
    • https://jivenikovo.weebly.com/uploads/1/3/4/3/134308789/pesavisejanik_tejamuvugalo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480145/normal_5fcae6d4366be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_5fe6d01073010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384310/normal_5fd72958c87a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416656/normal_6048fc2634cde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459180/normal_5ffb5f2ecb81d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417305/normal_6046aba514000.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376599/normal_60511bfaa7e00.pdfIn PDF document text
    • https://falufanimuv.weebly.com/uploads/1/3/4/3/134377488/nirorax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444100/normal_5fcdab06e0ce1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/14572dd8-393b-4ff9-9993-75f9921d1597/baby_girl_outfits_for_pictures_idea.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68d73189-5632-44dc-ad63-2ae5e58fc3b2/timupa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d58441f-d0f9-4561-a402-5524c4eb9157/tenexotufatomen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/258a39f2-86c5-4508-8fe6-78676336a33b/nunukezawitimerijetazox.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_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 5408 bytes
SHA-256: 8457de56ce3f235de2e25c2aa86e0effb25c8e257db8c5e17f4976878b408fb6
font_01_sfnt_off0000fef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF4 10916 bytes
SHA-256: 6eba483a70a44a0417556cf9e09931cf6107ba6802d9c7cfa3fefeca15996bca

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