Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7fb8274e1f549c…

MALICIOUS

PDF

72.8 KB Created: 2021-02-21 00:06:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 5f9472ae86f9e70152caab85d0f7bdba SHA-1: 198402a7587b1a848c50ef40fa29ca317ded0678 SHA-256: 7c7fb8274e1f549c97634eba487b51430884ab34b09f1518125b3f5ca7261c8c
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to external sites, suggesting it functions as a link farm or a phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document's structure is designed to host many links on disposable domains, a common tactic for distributing malware or conducting phishing campaigns. No scripts were extracted, but the presence of external URIs is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://maypoin.ru/wix?keyword=scp+014+lyon PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417995/normal_5fe27ae932b48.pdfIn PDF document text
    • https://rozazokosu.weebly.com/uploads/1/3/0/8/130813972/901e4fdedbc.pdfIn PDF document text
    • http://hopecommunitynaz.com/95171177167bhzn7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491705/normal_5fdd09dc6f009.pdfIn PDF document text
    • http://mnclassis.org/wegerirepixumeponepider97j5j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427519/normal_5fd671388f426.pdfIn PDF document text
    • https://nolujamikudaze.weebly.com/uploads/1/3/4/8/134868466/7338031.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376869/normal_5ff34a10138fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393889/normal_5ffdc7238ac8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444655/normal_5fe1290f4a889.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418365/normal_5fe84ab59c6c2.pdfIn PDF document text
    • https://maraduwiz.weebly.com/uploads/1/3/4/3/134363873/nudilar.pdfIn PDF document text
    • https://patoxudiza.weebly.com/uploads/1/3/0/7/130739147/9bcc8e.pdfIn PDF document text
    • http://spain50off.info/3510911502g19c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408990/normal_5ffc21481bb0e.pdfIn PDF document text
    • http://onenature.space/onesie_pajamas_for_adults_with_drop_seatww0vi.pdfIn PDF document text
    • https://vogapixafaroge.weebly.com/uploads/1/3/4/2/134234717/4296732.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_off0000e23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 4928 bytes
SHA-256: e44fc1699100f5a8cbcbd955868228f18442b0d5cbdb53856c4d0d982361b5f1
font_01_sfnt_off0000f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 10428 bytes
SHA-256: 548dbf1e89540d51f53a87b7d27fe20e2d2eadd09a8d119fd327d3bc1ffa30b0

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