Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a9bcb24bb39178…

MALICIOUS

PDF

69.5 KB Created: 2021-01-15 04:57:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ab046cc2abfa5486c95debd193e8f5e SHA-1: be5cd1fa399b5b80618c4bc40726586dc23c0add SHA-256: 04a9bcb24bb3917883a6d3c9756bb4ecd4e42377f880f1e36ad8a4aaf68f2e4e
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The document body, though heavily obfuscated, appears to contain keywords related to a 'Clarks infant shoe size guide', suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://ggtraff.ru/aws?utm_term=clarks+infant+shoe+size+guide
    • https://static.s123-cdn-static.com/uploads/4490542/normal_5ff9211c453cd.pdf
    • https://pivuwexigika.weebly.com/uploads/1/3/4/3/134320842/8191854.pdf
    • https://gigojajalul.weebly.com/uploads/1/3/4/3/134320096/pesazi.pdf
    • https://cdn-cms.f-static.net/uploads/4366662/normal_5f87286bb42e9.pdf
    • https://fakimodixoto.weebly.com/uploads/1/3/0/7/130739088/999b2734.pdf
    • https://cdn.sqhk.co/sojetaji/jihiKii/5716475065.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kewakuko/schubert_serenade_cello_sheet_music.pdf
    • https://s3.amazonaws.com/mubefula/pokono.pdf
    • https://s3.amazonaws.com/bubeto/burma_movie_1080p_hd_video_songs.pdf
    • https://s3.amazonaws.com/buxoparadazegu/470600245.pdf
    • https://s3.amazonaws.com/dezajok/86840412212.pdf
    • https://s3.amazonaws.com/fatisake/juful.pdf
    • https://s3.amazonaws.com/tapelu/darling_all_songs_masstamilan.pdf
    • https://s3.amazonaws.com/rodigapigeta/kikipepolo.pdf
    • 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_off0000d52a.bin
1ebc9643339b5a7375838932a17f6469c99aa138c2d1b3f590c79ca0885f814a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD52A 5188 bytes
font_01_sfnt_off0000e6d3.bin
66208eb77cc13af9738622e9590384bbef8ad2c63edb162076c322205d4184b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D3 10064 bytes