Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c29dbeba498a897…

MALICIOUS

PDF

79.4 KB Created: 2021-01-08 13:55:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c1ee03f749094e1fe9282317a864bb10 SHA-1: ebe3bf14569a5a96a0f4a92bd04d0798abff3b15 SHA-256: 7c29dbeba498a8979ab6cb5966f00768576fdee1444349685814556e04a1c654
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 of which are obfuscated or lead to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM and PDF_URI heuristics. ClamAV also detected this as Pdf.Phishing.Trojan. The embedded document body, though heavily corrupted, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The presence of numerous external links points towards a phishing or malware distribution attempt.

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://trafficel.ru/aws?utm_term=infinite+painter+user+guide PDF link annotation
    • https://cdn.sqhk.co/foxidagon/V6sEEih/30636983638.pdfIn PDF document text
    • https://cdn.sqhk.co/rogapakaler/a6Fsgjf/descargar_home_design_paradise_life.pdfIn PDF document text
    • https://jexujomasok.weebly.com/uploads/1/3/5/3/135343442/kasimewan.pdfIn PDF document text
    • https://cdn.sqhk.co/boketumejipa/cibpQwK/dogfighter_ww2_ps4_australia.pdfIn PDF document text
    • https://xizotuvulozig.weebly.com/uploads/1/3/1/8/131856772/xudawiw_xonipopikob_luwesavujef.pdfIn PDF document text
    • https://cdn.sqhk.co/sarowojep/gBQidja/districts_in_takhar_province_afghanistan.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/gg0jhZj/26035005399.pdfIn PDF document text
    • https://kowedeta.weebly.com/uploads/1/3/0/7/130775164/1789160.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/798a6bb3-79ec-49e2-ba4e-d7cdcb6777db/58646913641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4c455ed-2b7b-4463-9cd5-2edd20b148a3/moto_traffic_racer_2_mod_apk_latest_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/958dce97-90b2-4512-bca4-0a41deac727c/dorisonumotokeke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14c73eb2-fce9-4ae9-a945-3506b73525e8/74745112301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b6003e1-e683-4dc0-ab2a-d26f0b2102f6/moksha_meaning_in_hinduism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc1b04ba-d42d-4b6e-966f-b02721766cf3/22962262344.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee454612-d5fe-44a0-8d9f-8302329a143c/wheeler_dewitt_equation.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_off0000faab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAB 5112 bytes
SHA-256: 5c1cd4e449f9af6592734b25f0d07178ae0f910f0796a0b54732c2fe1003975b
font_01_sfnt_off00010c20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C20 10672 bytes
SHA-256: 6b483d9e28610056adac96704f077ef904b8d25e858009f74f2438a527ee2e93

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