Malicious PDF — malware analysis report

Static analysis result for SHA-256 724cdce671570b3d…

MALICIOUS

PDF

68.6 KB Created: 2020-11-18 12:45:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: be8ac26a8986a5e736b569d9e2d2342f SHA-1: b63ca0294d0c7cd473c056123d93022c00594922 SHA-256: 724cdce671570b3df0ea5e3fcc709da1f27fce1c49a74a3fe263eec2697a5c6d
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one identified as a 'PDF_SEO_LINK_FARM' and another pointing to a suspicious URL ('trafffi.ru'). ClamAV and an ML classifier also flagged this file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/aws?utm_term=bydureon+generic+form PDF link annotation
    • https://tedomidile.weebly.com/uploads/1/3/2/7/132712102/karejaxaman-natinatimobewe-xamij-pomud.pdfIn PDF document text
    • https://wozofawado.weebly.com/uploads/1/3/0/8/130874325/valewuweg_bababipasan_bobetigezapi_kuxim.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/8fd76c.pdfIn PDF document text
    • https://teguvubab.weebly.com/uploads/1/3/4/3/134347924/tuwen_saxenatire_birotixikaxama.pdfIn PDF document text
    • https://rolosakuzorega.weebly.com/uploads/1/3/1/3/131379035/7a015d.pdfIn PDF document text
    • https://vuvofazomegudej.weebly.com/uploads/1/3/4/3/134329778/bagapu.pdfIn PDF document text
    • https://nitaluba.weebly.com/uploads/1/3/4/3/134348735/femuv-maxoju-bedukufulen-vonof.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/08eb85c5-67bd-4321-9647-07cf1c1f212b/legend_of_korra_free_streaming.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/porokesi.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/94691023371.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/occupational_safety_and_health_act_and_regulations.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/evolution_worksheet_biology.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/75943861224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdd75ff1-8e64-45fb-bfef-94f4e7ebf4f1/23107814984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc1b53d8-7470-4280-8b0a-4cf31ae45b84/63826152759.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_off0000d024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD024 5072 bytes
SHA-256: 5cc6e2406a2ad01166e089915a2e5382749bd278568342e61ee0e92793bd9e99
font_01_sfnt_off0000e167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE167 10740 bytes
SHA-256: a5aacc1e9a83c92684fc84de5e71bf5faa669dbe2410b6e8938aef5f675bb0a5

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