Malicious PDF — malware analysis report

Static analysis result for SHA-256 78167871ebd7e671…

MALICIOUS

PDF

61.2 KB Created: 2020-11-19 04:36:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5633d2bc7232f2cc1b28cdfa4e61294c SHA-1: a131a0a06686427510f356ac4e8f8a21325ca0ad SHA-256: 78167871ebd7e67175e58ab82af01a12f3ed7b0c58eba546897aeb41d10f058f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. It contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The embedded URLs suggest an attempt to direct users to potentially malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/123?utm_term=smith+middle+school+chapel+hill PDF link annotation
    • https://sivipafegedijog.weebly.com/uploads/1/3/4/4/134443607/wugam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401515/normal_5f97cd13bcc78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392650/normal_5fa607f84a86b.pdfIn PDF document text
    • https://solujokorox.weebly.com/uploads/1/3/4/1/134108712/2f5b7f596.pdfIn PDF document text
    • https://tunuzari.weebly.com/uploads/1/3/4/3/134316111/1614768.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/452d94db-ba4e-48bd-a143-48e505839538/as_i_lay_dying_themes_shmoop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ae742c9-d351-485f-95b1-01349880d05e/fortnite_scrim_naw_discords.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e278792d-b63c-496c-b80f-4ca24c6ecbd3/48391125800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d9caf22-9314-42d8-ba2b-0ddfd76b6fb4/riddle_school_6_poki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b7f5f3e-2718-4a79-8193-33422bc2c27d/nifabawedigugujani.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/197bde46-7bb8-4323-bf21-7bc1d475e397/it_department_definition_wikipedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f0e9ad-6502-4946-92b4-d717e67b2bdc/giwirajagetenofok.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_off0000b52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB52A 5320 bytes
SHA-256: 4371eb9f7982e4522e3e11e81cf913fb6dbacf03a9656716ff97ab2e8ed4e9f9
font_01_sfnt_off0000c71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71D 10116 bytes
SHA-256: 3d540a7a2371b80d1eee8b42439aaf8977232f8645761d384566bdb7abd17831

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