Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd99efae429001f…

MALICIOUS

PDF

78.1 KB Created: 2020-12-19 14:36:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f0bf5d09143c529ca9383f707ac5a548 SHA-1: 99a82083fe94487c98cfc9df0f783326e0eb67dd SHA-256: abd99efae429001f3f310a54862a8a8f2b769ef5b5a63d579120f0f19e3351ba
156 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. The PDF contains a large number of external links, suggesting it's part of a link farm or SEO manipulation scheme. One of the embedded URLs, 'https://trafftec.ru/aws?utm_term=solar+system+formation', is directly associated with this activity. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of techniques used to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/aws?utm_term=solar+system+formation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374519/normal_5fd8172d74a0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470391/normal_5fa80a65973aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415519/normal_5f9d86c351e4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394066/normal_5fa3bd01a86a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367299/normal_5f8f14437636b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421048/normal_5fa1ebf10d8d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424026/normal_5faeabac54108.pdfIn PDF document text
    • https://mejulima.weebly.com/uploads/1/3/4/0/134040536/5ac60710cd2.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/95d9ef2f-62aa-489c-87c8-9e744733f664/munezidozolif.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/corpus_linguistics_for_vocabulary.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/likewenaforefogovufopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b7dd401-8d8d-4961-81b0-5cdca10e5468/45987600509.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0ca2ada-cda7-4703-8fe3-4a874c80fc67/memphis_grizzlies_roster_2009.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_off0000f61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 5116 bytes
SHA-256: f7f169d6047eb739bb39b07317f67da9cb96f8362ff752a64b9271ed023250d0
font_01_sfnt_off00010775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10775 10672 bytes
SHA-256: eda77231a29ce7ce1b961b49f822cf9e4ca0704b66d1fd60abcdbe5cbb99c18a

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