Malicious PDF — malware analysis report

Static analysis result for SHA-256 a619afa32bf378ff…

MALICIOUS

PDF

74.6 KB Created: 2020-11-20 22:05:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 5a865e504409f3c1a92c9934e5a983b5 SHA-1: 6f3a4845f34980c23aef443e1852b5fc7e07f98e SHA-256: a619afa32bf378ff68c5e1bc46c752254cb48f6161f87a8755a601a61e24c15b
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with critical heuristics identifying it as a redirector and a link farm. The primary malicious link points to `https://cctraff.ru/123?utm_term=volunteer+position+description+template`, which is flagged as malicious. The document body, though heavily obfuscated, suggests a lure related to a 'volunteer position description'. The presence of embedded URLs and the overall structure strongly indicate 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=volunteer+position+description+template In PDF document text
    • https://jubezotezuwu.weebly.com/uploads/1/3/4/4/134476040/6f401da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382790/normal_5f9a94e936b15.pdfIn PDF document text
    • https://jaserasozupog.weebly.com/uploads/1/3/1/4/131454215/dijaziw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369775/normal_5f89108428fd4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370090/normal_5fab286b6a567.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450336/normal_5fb3544579b6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391024/normal_5f97352f248b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387235/normal_5f9366cce5069.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/8c787e61-703e-4d99-8657-fad41a3bbc09/gubupofadezinelafexif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/127156cf-43ca-497e-ac0d-3ed7aca95804/wigumuzegi.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/lorutisopujoni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb22716c-6575-4c97-875d-4bd449925c08/38267631169.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c67283b2-515f-459b-adf9-07220a49a0e7/14328712428.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf4541d9-bf6a-43c7-b26b-a802bad757cb/gewarizizabu.pdfIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/lizesakuwokogitimidevujov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a81d5864-2a8b-410f-9c0f-b5d231372816/muwexif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82769764-c29b-40a2-a206-57dea416adcb/maple_story_ds.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD362 5184 bytes
SHA-256: e35d225cdfca5f839a6efdb2160041388ab3b1022396325275819d918711f3c1
font_01_sfnt_off0000e4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4ED 10308 bytes
SHA-256: 7c5ab3b759f7cb14ea0d29f479acf0dd489ad68944aa3d47e4e2f16eb3d4b039
font_02_sfnt_off00010848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10848 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90

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