Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a39fd790d64e79…

MALICIOUS

PDF

128.5 KB Created: 2021-02-08 22:31:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0c04d9faba9d4354000a08a5afa7f55a SHA-1: 6dc3c433c421aeadf8b36ece8c758af93872fccc SHA-256: 36a39fd790d64e79b3d79ceae3462e497010a060cce17fe3c9d71d68d9974565
156 Risk Score

Malware Insights

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

The file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a PDF phishing trojan. It contains a large number of external links, many of which are obfuscated or use numeric slugs, indicating a link farm or redirection scheme. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to malicious websites, likely for phishing or to download further malware.

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://jottigo.ru/aws?utm_term=vejiga+hiperactiva+pdf+2018 PDF link annotation
    • http://naturmilans.fun/15433629910w33ou.pdfIn PDF document text
    • http://filanion.online/zomajejekibimimotuluxeba1v95k.pdfIn PDF document text
    • https://cdn.sqhk.co/lepudijazur/XYhehhR/motogp_race_start_time_today.pdfIn PDF document text
    • https://cdn.sqhk.co/zekuxemelop/hbjjvS6/bigozazafamoze.pdfIn PDF document text
    • https://cdn.sqhk.co/beledufe/ffhajge/diamond_digger_saga_level_60.pdfIn PDF document text
    • https://gusupaserilobe.weebly.com/uploads/1/3/5/3/135312632/jepobuguxu_dulegorapabu.pdfIn PDF document text
    • https://cdn.sqhk.co/vomisape/b2xigic/kafuvelibagig.pdfIn PDF document text
    • http://kismyketio.com/blends_worksheets_printable_free98nc6.pdfIn PDF document text
    • https://cdn.sqhk.co/delojiwuguj/zhdiiv8/74875933634.pdfIn PDF document text
    • http://alifan.store/democracy_in_america_book_1avabq.pdfIn PDF document text
    • https://cdn.sqhk.co/gukugifixija/fG587wt/89150946123.pdfIn PDF document text
    • https://cdn.sqhk.co/xivovido/gfQYchi/broken_bones_lyrics_anti_flag.pdfIn PDF document text
    • https://cdn.sqhk.co/wozepefiga/iJhbham/star_wars_jedi_challenges_ar.pdfIn PDF document text
    • https://cdn.sqhk.co/xuvisisitinu/CjhHCji/zaxafelelinuvosarezedu.pdfIn PDF document text
    • https://wakejowedab.weebly.com/uploads/1/3/4/5/134599651/cc34392.pdfIn PDF document text
    • https://cdn.sqhk.co/seranowe/aijIPjb/89359952348.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19379 12332 bytes
SHA-256: dd2a3cdd6dcfb1d96bef0f9e53c8c4fdd841b7f03d8a6105a63c09d4ed808463
font_01_sfnt_off0001b9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B9D0 5828 bytes
SHA-256: 493f53e0a7612230c0832f812e8773656d28e7b90cb426dfa2d5333d5d297582
font_02_sfnt_off0001cdbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CDBE 11768 bytes
SHA-256: c23ade6b6b498e4a2bf0677c15788f63840e7cd99deb9dc572d14fb168f633bb

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