Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b0ebb4fca1fcc01…

MALICIOUS

PDF

78.4 KB Created: 2021-02-25 08:51:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 277db122ed574c235ec8837243f79560 SHA-1: 0433f4a5592346363188b74dcdaca8ffd8c27d24 SHA-256: 6b0ebb4fca1fcc01acce5a759a823fc0cf57f68388b4c8deb6bf9528a0781c3b
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URIs points to 'bologen.ru', which is associated with a search for 'hotspot shield free vpn proxy apk mod', suggesting a lure for potentially unwanted or malicious software. The ClamAV detection and ML classifier further indicate malicious intent, likely related to phishing or malware distribution.

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://bologen.ru/wix?keyword=hotspot+shield+free+vpn+proxy+apk+mod PDF link annotation
    • https://cdn.sqhk.co/xawobovuji/aEggdjg/telecharger_multiple_accounts_parallel_space_dual_accounts.pdfIn PDF document text
    • https://cdn.sqhk.co/revowemerem/igeWBSk/21611607921.pdfIn PDF document text
    • https://nanotobu.weebly.com/uploads/1/3/4/6/134638189/113899dbf2a.pdfIn PDF document text
    • https://nexudusuje.weebly.com/uploads/1/3/0/7/130740550/e9da7.pdfIn PDF document text
    • https://cdn.sqhk.co/kepilujofeje/SThiibA/61228231495.pdfIn PDF document text
    • https://cdn.sqhk.co/tulotunofuz/cw0icib/40011391153.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dezajok/mokukemixakakibabegu.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/86155136770.pdfIn PDF document text
    • http://vezavajizuvos.epizy.com/mri_abdomen_anatomy.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/triple_baconator_nutrition_information.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/6660687523.pdfIn PDF document text
    • http://larazegabolulaf.epizy.com/82382716138.pdfIn PDF document text
    • http://tixinova.rf.gd/lagu_oh_asmara_versi_reggae.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_off0000dc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC86 5536 bytes
SHA-256: f8b9087d9628217102e975b5ee7571f0ac3c916788db9491b0fee66d2141744d
font_01_sfnt_off0000ef3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3D 11524 bytes
SHA-256: 9ee32d9320896d7aed931817c1e95851f7862726dea2c9f265f6b4ac854b38f8
font_02_sfnt_off000116da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DA 16272 bytes
SHA-256: 237097c6e47a5cedf91ddbc595faf0678b5acb9ebc76cbec69915f637e149ee8

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