Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8c631bb9f9df945…

MALICIOUS

PDF

81.1 KB Created: 2021-02-21 06:46:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d0a56bfe957d7be84f88bf6e7df71db9 SHA-1: 5789355d092495c3358a7eedab89ae861cf0631b SHA-256: a8c631bb9f9df94512fc7760309827b574bbcae25efd3ecbaebc29e27249381d
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, identified as a 'link farm' by heuristics, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate malicious content, specifically phishing or trojan activity. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

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/123?utm_term=baby+names+inspired+by+book+characters PDF link annotation
    • https://cdn.sqhk.co/pepupiribojo/giiejfK/kosiso.pdfIn PDF document text
    • https://napuximijagebi.weebly.com/uploads/1/3/4/7/134766840/618d139fade7f.pdfIn PDF document text
    • http://ejqy.com/vuzizowuvemorolukotardpn.pdfIn PDF document text
    • http://fastpysystem.online/7197957827lmbh4.pdfIn PDF document text
    • https://cdn.sqhk.co/dodalowogiv/jfRgogh/40623793241.pdfIn PDF document text
    • http://mnclassis.org/barfi_movie_mp4_hd6b5yr.pdfIn PDF document text
    • http://moitender.org/96359683005j4b0o.pdfIn PDF document text
    • http://opticsystem.website/bevosik4frpu.pdfIn PDF document text
    • http://ses-paypal.com/83133110860pfueq.pdfIn PDF document text
    • http://itdiscounts.pro/xobefifufuludoweligutosi2zfdf.pdfIn PDF document text
    • http://genusttwsr.fun/100_monster_hunts_downloadadwl2.pdfIn PDF document text
    • https://cdn.sqhk.co/niwuruba/vJELvii/rewujuzidejopikataxurowet.pdfIn PDF document text
    • https://pumutetigowon.weebly.com/uploads/1/3/4/6/134699291/491463.pdfIn PDF document text
    • http://bestsaleshopin.xyz/lehman_brothers_case_study_answersid7id.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/defipedibe/68869398859.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/matilda_book_review_template.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/35433790967.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/terminator_2_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/aptoide_install_apkpure.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_off0000fe54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE54 5636 bytes
SHA-256: 68f53f6122cb5a623aa04fcc28e6e1771ab5aea9f2641701b5836d863437babc
font_01_sfnt_off00011156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11156 11148 bytes
SHA-256: 9f2358afb29f50a534271a137ea20373c1eebdde0968af410852c7828a67abf3

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