Malicious PDF — malware analysis report

Static analysis result for SHA-256 07ad9b11243b2abd…

MALICIOUS

PDF

82.5 KB Created: 2021-02-23 11:00:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a851fc05b68a39f56bf25b9c0fd70eb4 SHA-1: 686c58af1f7175f0d2006ad2755805cad1631b2b SHA-256: 07ad9b11243b2abd8a2aff4b2e60d0d79ce160915c4debd4987e8f7fe65df3c4
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or redirection scheme, likely initiated via spearphishing attachment.

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://jottigo.ru/123?utm_term=how+much+do+computer+engineers+make+in+texas PDF link annotation
    • https://jutokikifugata.weebly.com/uploads/1/3/1/0/131070124/9100f33abc11d.pdfIn PDF document text
    • http://cashtanks.fun/nature_alphago_zero49kzy.pdfIn PDF document text
    • https://webupusew.weebly.com/uploads/1/3/5/3/135344455/4778044.pdfIn PDF document text
    • https://mefosenide.weebly.com/uploads/1/3/4/7/134715399/kulij-pepali.pdfIn PDF document text
    • http://xxlmature.site/metal_futon_assembly_instructionsus1qz.pdfIn PDF document text
    • https://zazobowelukoki.weebly.com/uploads/1/3/0/9/130969428/lobojob.pdfIn PDF document text
    • https://zasufademebarav.weebly.com/uploads/1/3/4/7/134737005/64e61091c80c8c.pdfIn PDF document text
    • https://kodugeji.weebly.com/uploads/1/3/6/0/136089350/2304306.pdfIn PDF document text
    • http://povar2020.site/polajuwireduwefafozumowyihbf.pdfIn PDF document text
    • https://xidazujagavoza.weebly.com/uploads/1/3/1/4/131453269/2b2e435a45a5.pdfIn PDF document text
    • https://sezijaxafiv.weebly.com/uploads/1/3/1/6/131637080/suxikatipetadug.pdfIn PDF document text
    • http://curvepreloved.com/timevajojusotujezo3djrj.pdfIn PDF document text
    • https://dilipifoson.weebly.com/uploads/1/3/1/0/131070096/b98e1.pdfIn PDF document text
    • https://labelamujevodit.weebly.com/uploads/1/3/1/6/131606697/e104a3cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/rijaliwiguvex/carrying_noun_form.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/rowapi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B9 5640 bytes
SHA-256: ea7845bbcba2178eb28d5b8d8208cc76991bf2faff79c0fafedb21f107a2b408
font_01_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 11084 bytes
SHA-256: 0af3c7084380cf47b6aa0533782c84165d4cddbccc41003bb82bcccd6b6ec8e7
font_02_sfnt_off00011e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9F 9048 bytes
SHA-256: 47b5ba580a2a8f27a9c82413bcc184cb0aae8bc0521926906a84a5645aa4e4f4

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