Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4597f5088bfbc3…

MALICIOUS

PDF

70.5 KB Created: 2020-12-10 09:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: a0a6f673e3e8768c44f9654fb5e901a3 SHA-1: 75822af39d138d17ecae0844fe70d0de57a97873 SHA-256: 8e4597f5088bfbc3c3f3b375dafc52b86cd0ab25ea415e8d6ce62c26a314c786
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these links. The embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the nature of the document as a mechanism to drive traffic to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/aws?utm_term=mp+pre+b.+ed+exam+form+2018 PDF link annotation
    • https://bawujepal.weebly.com/uploads/1/3/4/5/134515469/c21e49f3bb29.pdfIn PDF document text
    • https://vadazexo.weebly.com/uploads/1/3/4/6/134646317/22c8ae6bc972.pdfIn PDF document text
    • https://waxebusesu.weebly.com/uploads/1/3/4/7/134770319/lakiwobir-vaxaloginokosu-jakasijexapo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420930/normal_5f996ef8a39ff.pdfIn PDF document text
    • https://letazofuwukuge.weebly.com/uploads/1/3/4/8/134869061/c1e8e923833c8f.pdfIn PDF document text
    • https://mowolonob.weebly.com/uploads/1/3/4/8/134874237/509961.pdfIn PDF document text
    • https://kotuvowomikek.weebly.com/uploads/1/3/4/3/134370123/5ee0c.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/1386898.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387715/normal_5fb49ec478ec2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc5203dc30a162e0c6de521/t/5fcf108c1901dd4d2ecc9089/1607405718184/best_jump_rope_videos.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/jijujewedifatubowazutofok.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3caf68139af0376573afc/t/5fcee8df05f6f278074bdbb9/1607395551433/paper_bump_3d_print.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/scream_full_movie_online_free_no.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e99fa13a450babf41659/t/5fc52c983570fb44d1a9b7bf/1606757528446/ways_of_the_world_textbook_chapter_10.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_off0000d480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD480 5740 bytes
SHA-256: 38ee1b8cef7e1caa5a6ac6b87ae9fe78528012a9e669eb815ab1d9ae31cfdd03
font_01_sfnt_off0000e80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80B 10548 bytes
SHA-256: e04c736a451d38da6809dcaa95fd2207a2d7887f6f82d76c10ac8d6890ed8838

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