Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b78b2266d98d9e0…

MALICIOUS

PDF

85.0 KB Created: 2021-01-08 23:16:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2c74654476fe7129c1f5e01071215f42 SHA-1: d19a3acd3a35f4ba9a759c22fb56f45df6e2b3c7 SHA-256: 0b78b2266d98d9e0d7474df1834b505624e4de46c142e9683539886616b8a1db
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 hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, references 'Mf solutions 630 meter transmitter converter', likely a lure to direct users to malicious URLs such as https://trafffe.ru/123.

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://trafffe.ru/123?utm_term=mf+solutions+630+meter+transmitter+converter PDF link annotation
    • https://cdn.sqhk.co/lelogusobade/jjB9hTk/josirosivetotemem.pdfIn PDF document text
    • https://kojelokawuzu.weebly.com/uploads/1/3/4/3/134341929/teviduvowofi_linerafisewop_xikesejuzoxijo.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/zEia5MU/nintendo_switch_console_bundle.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/22b943ce4.pdfIn PDF document text
    • https://larogarokod.weebly.com/uploads/1/3/4/0/134018293/polekup.pdfIn PDF document text
    • https://sizomejuxitiz.weebly.com/uploads/1/3/4/7/134748976/pogujedabiro.pdfIn PDF document text
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/sawupaxatozopikado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496402/normal_5fd1c61b52831.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376857/normal_5f980f2c12700.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/6568ad33-5694-4d40-bbff-6296f4faaf78/mass_of_proton_and_electron_in_grams.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/vejewene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/220304c4-1470-4be8-93b2-33dff0834578/tesezabulesozazodu.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_off00010daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAF 5552 bytes
SHA-256: 879c210a03eb13f6ced91ba895814edcbdbe3bea4e5e2c881d7b28791bf4fa9e
font_01_sfnt_off00012090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12090 11220 bytes
SHA-256: d104c9bf8c2bf6dcde724cdd15b81ac12623e76a17409de865a5133ebf5aa5df

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