Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a34f03e6f6ec09…

MALICIOUS

PDF

67.0 KB Created: 2020-12-30 09:23:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8ce43b3b5fdd739d07fd409998bac4b3 SHA-1: 127e24e2548af75816df0fcd08b66077382d2d93 SHA-256: b5a34f03e6f6ec091bc39450178868ee78601bf5bb713e16356ee0867913dbbf
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, directing users to potentially malicious websites. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to ggtraff.ru, indicating a redirector to malicious infrastructure. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF, likely used as a lure for 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
  • 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.
  • 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/strik?utm_term=bubbles+mobile+pet+grooming+fairfax+va In PDF document text
    • https://safalijig.weebly.com/uploads/1/3/1/0/131070993/c3a2e8e1d57e.pdfIn PDF document text
    • https://cdn.sqhk.co/jetobatu/cbeRgjb/punutajosilukux.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/cNwifhe/wisenirifutege.pdfIn PDF document text
    • https://gakexuguzadeza.weebly.com/uploads/1/3/4/4/134401700/sifuxufapuna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417025/normal_5fb37d5e1010e.pdfIn PDF document text
    • https://cdn.sqhk.co/gatutojuse/rYjdgix/megan_boone_net_worth.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405899/normal_5fbae16680eb5.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/pozokimepe/ginusawizutevuxoxifaduvar.pdfIn PDF document text
    • https://s3.amazonaws.com/faluzotixupi/89658845255.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/97680072375.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/8577933988.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/22915953902.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_off0000c8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8DC 5536 bytes
SHA-256: 5772e9fdd1f50632a7d7aa7ea09bce51b8aeaaae88d23e103cb900e382beaa08
font_01_sfnt_off0000dba5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA5 10400 bytes
SHA-256: a3455710688b3ba4ac278ab5201b4165745538d77cd7fe568bf3fa2c8cd883bf

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