Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e3e641a9db3d176…

MALICIOUS

PDF

65.6 KB Created: 2020-12-21 18:04:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 806ab57ba3dae9b38ef03a87119fc91d SHA-1: ee8a39f7c02ee299633b50939c4846916be47388 SHA-256: 3e3e641a9db3d176aa185b7c61fe61f352d6e6d7d78163062aba1761f89d777f
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. Another heuristic flags a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via the linked sites.

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://cctraff.ru/strik?utm_term=new+greatest+hits+albums+2020
    • https://fafofezun.weebly.com/uploads/1/3/4/3/134338513/nakipigakazus-xufozafi-gafigotuk-fuxojo.pdf
    • https://sibakixode.weebly.com/uploads/1/3/2/8/132814768/bc7b735791a74df.pdf
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/1734465.pdf
    • https://sakuvajavabese.weebly.com/uploads/1/3/1/3/131383602/kenewikagav-danuwope-sutife-suvewiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b874419b-da39-442b-b6e5-1804f57aa0d5/i_wish_you_the_best_email.pdf
    • https://s3.amazonaws.com/sitok/basic_appointment_letter.pdf
    • https://s3.amazonaws.com/nemafu/quantity_adjectives_worksheets.pdf
    • https://s3.amazonaws.com/tuzamada/algebra_formula_sheet_free.pdf
    • https://uploads.strikinglycdn.com/files/fef042d1-9abd-4879-9c59-3389a54854be/pipboy_alarm_clock.pdf
    • https://s3.amazonaws.com/wefadep/usps_tracking_number_format_sample.pdf
    • https://s3.amazonaws.com/widetunipet/86150802472.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_off0000c434.bin
af4262d898051d67d78c69ce12deba7e63499736d8ed449c2240c9547411df38
pdf-font-stream PDF embedded font (sfnt) at offset 0xC434 5572 bytes
font_01_sfnt_off0000d716.bin
bc5755b6164f1cfaf00b307e6c00b523e5c6c7191037d68e903de76ee46cb5c2
pdf-font-stream PDF embedded font (sfnt) at offset 0xD716 10232 bytes