Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7cecef8803623c4…

MALICIOUS

PDF

78.1 KB Created: 2021-03-01 21:13:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5e0a0cf86d442521a73be90d782db1f1 SHA-1: d337fff7823ddbec9cbecf137bb81bbc60f556a2 SHA-256: e7cecef8803623c4bf7a6e8dbeb1a83f75383a52949ff74300fbf5ec8215166f
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, and contains numerous links to external websites. The heuristic firings indicate it is a link farm designed to redirect users to malicious infrastructure, specifically mentioning a link to dafemum.ru. The document body, though heavily obfuscated, appears to be a lure related to a 'wing chun training manual'. No scripts were extracted from this sample.

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
  • 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.
  • 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.
  • 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/aws?utm_term=wing+chun+training+manual+pdf In PDF document text
    • https://lunokebu.weebly.com/uploads/1/3/4/6/134648327/5d91b622.pdfIn PDF document text
    • https://lotepipi.weebly.com/uploads/1/3/1/4/131454034/lulimesofama.pdfIn PDF document text
    • https://kazenatujexisof.weebly.com/uploads/1/3/1/6/131637291/1c511cf.pdfIn PDF document text
    • https://tawedituja.weebly.com/uploads/1/3/4/8/134864040/4863222.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444117/normal_5fe2ca415cbf9.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/gHgiuhd/cross_roads_isd_football_schedule.pdfIn PDF document text
    • https://dudunubute.weebly.com/uploads/1/3/4/1/134132035/80a8c11c85d3f9.pdfIn PDF document text
    • https://cdn.sqhk.co/liweruruzed/Dgcjjei/bellator_mma_gloves_amazon.pdfIn PDF document text
    • https://tewawizibix.weebly.com/uploads/1/3/5/3/135347661/dejetotupivewaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406169/normal_601acf0ea9343.pdfIn PDF document text
    • https://sujujawajiz.weebly.com/uploads/1/3/5/9/135964945/6657992.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483365/normal_60053f0f1fa0f.pdfIn PDF document text
    • https://sexojeno.weebly.com/uploads/1/3/3/9/133997780/4108956.pdfIn PDF document text
    • https://bezijenogekise.weebly.com/uploads/1/3/4/8/134875893/6118700.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408703/normal_5fec9ff81ffea.pdfIn PDF document text
    • https://vasefifux.weebly.com/uploads/1/3/1/3/131382239/lupibuzosowij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 5404 bytes
SHA-256: 1912dbb8aefa1b469d82490cffb269a2ba393250f973221a034a005544153311
font_01_sfnt_off00010761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10761 10524 bytes
SHA-256: e5f67730109266c83f44d1af39a85bcdb31d9b6b0a8f3e14833d6f07956cb464

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