Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b36fb08076f171…

MALICIOUS

PDF

65.8 KB Created: 2020-12-21 10:02:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 398ac93357a6661238cfedc6863e6f34 SHA-1: 22dd5d53a1865170c9431d718f5aa66549b3a9f2 SHA-256: e1b36fb08076f171059ef865e60fdfc471fa868c4eff143515655a300c872903
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/strik?utm_term=national+test+abhyas+for+pc PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452594/normal_5faa462c6c0e1.pdfIn PDF document text
    • https://dudosixe.weebly.com/uploads/1/3/4/3/134323580/5353867.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418587/normal_5fa19b73b8ef2.pdfIn PDF document text
    • https://fupevigojajoma.weebly.com/uploads/1/3/0/7/130738700/5813131.pdfIn PDF document text
    • https://nujamoxe.weebly.com/uploads/1/3/4/2/134234607/733cf578dbcd1b.pdfIn PDF document text
    • https://koxalisibigemig.weebly.com/uploads/1/3/4/8/134854932/7126241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f960513cd6b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379722/normal_5f97614ce92e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389366/normal_5fc24de7dfbf1.pdfIn PDF document text
    • https://dolevepi.weebly.com/uploads/1/3/4/5/134587457/vevovesemeriw.pdfIn PDF document text
    • https://waziketezu.weebly.com/uploads/1/3/4/6/134648841/9884497.pdfIn PDF document text
    • https://badadivuzadan.weebly.com/uploads/1/3/4/5/134523039/zoletibozababod-pavaz-jijipeviwir.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/af7b60d6-4fb7-4658-ac57-58c603776fa4/gaxogutofalavibefazos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bab3eec0-08ed-42b7-971c-4f659ec6616c/najiwowipadenowaxuzogex.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_off0000c46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC46C 5316 bytes
SHA-256: c5249ca2066b05d1319a34f91aa4a706bb64c41b1d225c313002cc95e19dd363
font_01_sfnt_off0000d684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD684 10560 bytes
SHA-256: 609c8b927c4ab3828de0d8183ee7b41b01984cfa5b3ad93a7fb3e6a47c8a5b1f

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