Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6dba39b6c5d7506…

MALICIOUS

PDF

67.3 KB Created: 2020-11-18 18:21:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 61a45beb555ada2a4901e047c539cb5f SHA-1: d10cdef147fe0e1759009267fd0ad234a06a2482 SHA-256: d6dba39b6c5d7506a6332c4d5f0413fd1ac0f3fdf5e6c01d7c4307815d0e664f
186 Risk Score

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, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the PDF structure itself are indicative of an attempt to redirect users to potentially harmful content, possibly for phishing or malware distribution.

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://traffset.ru/123?utm_term=d%2526d+homunculus+reddit PDF link annotation
    • https://relogeseji.weebly.com/uploads/1/3/0/7/130739887/165c98.pdfIn PDF document text
    • https://patufefuwo.weebly.com/uploads/1/3/4/3/134312622/59c7f942e5d866.pdfIn PDF document text
    • https://zaderurumanig.weebly.com/uploads/1/3/4/5/134588260/lewogejofijameti.pdfIn PDF document text
    • https://tarirubawapub.weebly.com/uploads/1/3/1/6/131606173/ziraritif-vanobokavajuru-muzasopixopuwab-jusosiwiv.pdfIn PDF document text
    • https://suvuzijovibalis.weebly.com/uploads/1/3/4/6/134660606/jipobipuvijawe.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/6023986.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/5d1a1aa0-1468-49f0-980d-e701856ba933/91164650747.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/sekipib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60ec887a-4b98-4b75-a532-fa0aca078965/gujaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/933ae123-9d0f-4ab1-a147-d5fe5f55e8cf/dobezogixedego.pdfIn PDF document text
    • https://s3.amazonaws.com/luramamelolem/green_bay_east_high_school_alumni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a32a4106-1498-4715-98df-49dbff0bf966/87439582247.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4ef79c0-7deb-478a-9b7e-2ece4e494735/30831401946.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_off0000cbfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFC 4156 bytes
SHA-256: 7b9a78bc71d00e4bcff8473d51fc82c270a18144a13d22e5cfd906eda86eaada
font_01_sfnt_off0000da2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA2A 11752 bytes
SHA-256: f2c18460c81bf0f662a7ddf302da0b2b4b7bf3ec6378d1a8d7b2f1e4bcd76661

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