Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cf0ed301405dcc8…

MALICIOUS

PDF

74.6 KB Created: 2021-02-16 18:12:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 858a03603a4c53466528a3abb52c7e89 SHA-1: 6531b410dee1700358d41f9313e32da18fcfa610 SHA-256: 9cf0ed301405dcc87c34d20ae096c722637d6f06d04621abb991628ce0a999a8
156 Risk Score

Malware Insights

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

The PDF file contains multiple external links, with one prominent link pointing to 'baarspo.ru', suggesting a phishing or scam attempt. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, further supporting this. Although no scripts were explicitly extracted, the presence of PDF-specific heuristics and the nature of the embedded links point towards a malicious document designed to redirect users to potentially harmful content.

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://baarspo.ru/123?utm_term=new+rules+of+lifting+supercharged+pdf PDF link annotation
    • https://cdn.sqhk.co/zafupusapun/iIia0yW/the_walking_dead_october.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/4thgiQ3/nintendo_switch_console_only.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385020/normal_5fcc3de4ac18e.pdfIn PDF document text
    • https://nutiniwe.weebly.com/uploads/1/3/4/8/134870290/dazomuwidusagepes.pdfIn PDF document text
    • https://biramufon.weebly.com/uploads/1/3/4/7/134775887/3e53d0168.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/sezebepit/glow_party_free_psd_flyer_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/wenokejajasinibunenanuri.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/19703294154.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/66494768440.pdfIn PDF document text
    • https://s3.amazonaws.com/lizuseguwix/hockey_jersey_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/30424069324.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/peter_drucker_marketing.pdfIn PDF document text
    • https://s3.amazonaws.com/pipaneku/backing_tracks_for_drums_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/25625725368.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_off0000e61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61C 5476 bytes
SHA-256: e45cc0340870b73e02b81bde50151385ffdd8d3e18280cd44465e6058db19de1
font_01_sfnt_off0000f8d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D0 10588 bytes
SHA-256: 284e7cc10a2759c5248294ab80855ba382fcbabaebc628443acc0e0620fa0ad4

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