Malicious PDF — malware analysis report

Static analysis result for SHA-256 795d383ccf2cc418…

MALICIOUS

PDF

65.9 KB Created: 2020-11-22 21:01:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1267a79fdf56fa38f118345a97b4a5fc SHA-1: 79631daddd566941033027f779cd50e821ac7120 SHA-256: 795d383ccf2cc41892cd7a2d96c27565f5b55305d7f9b009dc2afb14a08b0d88
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 pointing to other PDF files, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the PDF structure and numerous external links are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffine.ru/123?utm_term=seeds+of+happiness+reviews
    • https://megadezatesaram.weebly.com/uploads/1/3/0/7/130776649/kozasoj-gapuro-zuwidaru.pdf
    • https://cdn-cms.f-static.net/uploads/4470408/normal_5fa3badc2d549.pdf
    • https://fukobararusi.weebly.com/uploads/1/3/4/4/134404541/7297634.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/cf8f4adc-307b-4df8-9d9c-83b1ea6d5bff/kezezowugojalimo.pdf
    • https://uploads.strikinglycdn.com/files/8d695b94-3577-4868-a7fc-79ab593f9ba2/bemilote.pdf
    • https://s3.amazonaws.com/gotijejaj/btc_blockchain_price.pdf
    • https://s3.amazonaws.com/fumiposamisur/nutritional_biochemistry_tom_brody.pdf
    • https://s3.amazonaws.com/juzalizuvar/xikevusozi.pdf
    • https://uploads.strikinglycdn.com/files/f5a5a56a-9177-46d8-90c3-63bc5194d8fb/couscous_health_properties.pdf
    • https://uploads.strikinglycdn.com/files/681e96f8-6021-4810-84bf-6768617743fc/sabumagavonebejid.pdf
    • https://s3.amazonaws.com/luxelula/fozelitaso.pdf
    • https://uploads.strikinglycdn.com/files/edcb8b6c-fa3b-4f0f-bf05-6f40b300d2c1/dejiwetakatu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c597.bin
cfe13a4244d882afc4c9540bdc99f7864ab8fed06bf4ca224bf63c820bc858e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xC597 5352 bytes
font_01_sfnt_off0000d7dd.bin
33b56560e5905c7de727cad73013e6fbd62bbdcbfd30799cf734743669048f6a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 10292 bytes