Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a6ae9d2bc09c849…

MALICIOUS

PDF

66.3 KB Created: 2021-03-25 12:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7e7dcdabf6f4c7d84e0f12daf6e29ca SHA-1: ead511b2297b011e6981c9adbbf48035a30dd99b SHA-256: 6a6ae9d2bc09c8491169e1827a7197d1aa863028ff7cf50bfb4ab8ceb2132306
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF documents, suggesting a link farm or SEO spam tactic. The primary URL, https://ponafet.ru/123?utm_term=bing+ad+certification+answers, is presented as a lure for "Bing ad certification answers". While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely for phishing or driving traffic to malicious sites.

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://ponafet.ru/123?utm_term=bing+ad+certification+answers
    • https://cdn-cms.f-static.net/uploads/4485457/normal_6034183caea85.pdf
    • https://static.s123-cdn-static.com/uploads/4421477/normal_6001e6e335be2.pdf
    • https://cdn-cms.f-static.net/uploads/4462350/normal_5fd8554200e0b.pdf
    • https://cdn-cms.f-static.net/uploads/4390381/normal_6027c643d930f.pdf
    • https://cdn-cms.f-static.net/uploads/4404750/normal_604b337d3476c.pdf
    • https://cdn-cms.f-static.net/uploads/4379744/normal_5fea225521459.pdf
    • https://static.s123-cdn-static.com/uploads/4493610/normal_5ff7a7347469e.pdf
    • https://cdn-cms.f-static.net/uploads/4412999/normal_6017b18322d54.pdf
    • https://cdn-cms.f-static.net/uploads/4372074/normal_5fea091f59fbe.pdf
    • https://cdn-cms.f-static.net/uploads/4470982/normal_602bdd8f20b1a.pdf
    • https://cdn-cms.f-static.net/uploads/4374535/normal_603b414b44e1b.pdf
    • https://cdn-cms.f-static.net/uploads/4465564/normal_5fd30a0cca067.pdf
    • https://cdn-cms.f-static.net/uploads/4389816/normal_6031ba3d48dce.pdf
    • https://static.s123-cdn-static.com/uploads/4422144/normal_5ff94941cba8d.pdf
    • https://static.s123-cdn-static.com/uploads/4456687/normal_60078ab7a7c80.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_691ea55d3da14ea8910768f1cbfc4d4c.pdf?index=true
    • https://s3.amazonaws.com/gavapozalilup/how_to_prepare_for_gre_test.pdf
    • https://s3.amazonaws.com/zuguvoxoki/broadsheet_south_melbourne_cafes.pdf
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_1d687ce0511947c9948dac5dffafb08c.pdf?index=true
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_80d26acfd62e4431a31d2efdd6f638d2.pdf?index=true
    • 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_off0000c6a6.bin
aad758b3598a23174fc6d2b7398d9ea329019350edfb52a89becb51ade5ef21b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6A6 5300 bytes
font_01_sfnt_off0000d8d5.bin
4f76e569a0b504fa8f667be7df6e8eb90a6c88f56bbfdee694965149e8d83bb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D5 10380 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.