Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd791190b5d84a82…

MALICIOUS

PDF

69.3 KB Created: 2020-11-20 23:10:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5077de5b016430a1b31fb409f453ce60 SHA-1: c2c80544296ab23c1e34140611ac907fb475e1c5 SHA-256: fd791190b5d84a82bedb810cb906d89f564f240c058ac5d316d8302e868d3b82
186 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 as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/123?utm_term=guided+reading+activity+22+3+answers PDF link annotation
    • https://poraduke.weebly.com/uploads/1/3/4/3/134385775/7585021.pdfIn PDF document text
    • https://momibugu.weebly.com/uploads/1/3/4/6/134674353/92f15c8400e3.pdfIn PDF document text
    • https://gazesomudari.weebly.com/uploads/1/3/1/0/131070071/rovusuwu_bimuwuxilewivug_sekadelulakara_dafezurajejijat.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/2384642.pdfIn PDF document text
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/mivuxumisava.pdfIn PDF document text
    • https://neziraninev.weebly.com/uploads/1/3/4/5/134502601/5384466.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393759/normal_5f92499fc01a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365634/normal_5f870881df57b.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/003131ab-e55f-4db7-88e0-40e79df947c3/30211062607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f75498a-d6bc-44dc-97b2-cb136dd2a206/wakog.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/kewoxuvusularijotuzavetel.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/50034352151.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fd282e6-4948-41d4-a033-abdcb209a875/vanu_sovereignty_vehicles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2b8ef65-94d8-4d74-a2b7-fa633e9064d3/9758985757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0902a406-e780-4045-bacb-c95f6f1e2c65/primo_levi_the_gray_zone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91ad2fbc-9b0b-466b-9e65-b9abb7f5b469/zulet.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_off0000d234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD234 5656 bytes
SHA-256: 83e971a71338f0f0609a62c782ae51ab0eea51c4317410a32b1199b67fc2878d
font_01_sfnt_off0000e5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A5 10080 bytes
SHA-256: 708f6de8265824d2341cd5d378d8e468933980a1948877c66feb587cac906e77

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