Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ab0270ac75dc4d…

MALICIOUS

PDF

72.1 KB Created: 2020-12-17 22:41:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: a3f78bd23b0d39eef76e87fadab00ea4 SHA-1: 158668058b9e2b86dd2307d1fca71ff5fe3b7bb9 SHA-256: f8ab0270ac75dc4d0ecc128bbee4a3c322ad770018845140389fb1e95737cbb4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO manipulation tactic. The primary URL, https://traffnew.ru/strik?utm_term=teacup+dogs+for+sale+in+oregon, is presented as a search result for 'teacup dogs for sale in oregon' to disguise its malicious intent. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

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 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.
  • 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://traffnew.ru/strik?utm_term=teacup+dogs+for+sale+in+oregon PDF link annotation
    • https://fopozawiluni.weebly.com/uploads/1/3/4/3/134383369/166382.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451955/normal_5fd9a7f54cbeb.pdfIn PDF document text
    • https://xovonanukotu.weebly.com/uploads/1/3/4/8/134898985/wokugin_wimigafivuni_damifadavuk_mogogakejif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448124/normal_5fbaa2b4ebc69.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/5fc5ab97405d5340f34a42aa/t/5fcbbcb61df7590d80e6f95c/1607187639393/sabus.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/43398963026.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/blue_formal_dresses_plus_size_with_sleeves.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbffa571c8c7413142c9acf/t/5fc15116a97599144e286472/1606504727028/diboladozurutegome.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/66625631180.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe1fde3f75b166439deac9/1606295520939/9.8_meters_to_feet.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc375e3ab79f442f239d171/t/5fc54d1e3f75b1664382c3a4/1606765854780/jisapidejeta.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85D 5272 bytes
SHA-256: f8fe23d47422873fda948907b0a0867cf2d9f11f95e05e4667246461e65f2f93
font_01_sfnt_off0000da5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5C 10552 bytes
SHA-256: a89aeb68578bd6c1973371b62b72dba5462237638f1cc45349721f3414d69533
font_02_sfnt_off0000fec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC0 16168 bytes
SHA-256: e5458d7b6d82539349b17fc4713a17e1381d471255c72d9f8116b7c86e08c443

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