Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca7dad3bdecba15c…

MALICIOUS

PDF

97.2 KB Created: 2020-11-30 23:33:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 311446414b63d58c8a8c428d743c0e28 SHA-1: 16b1640157fab2cccec9efb80acfe9f6c51d7126 SHA-256: ca7dad3bdecba15cc7f2d78dca3c69e49f270748a678bba2d48b96f82cf88c88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. It contains numerous external links, with one pointing to a suspicious URL that appears to be part of a link farm designed to distribute malicious content or phishing pages. The ClamAV detection further supports its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://trafficel.ru/strik?utm_term=ohio+river+valley+map+1700
    • https://sokexuwog.weebly.com/uploads/1/3/4/3/134351495/kawepiwepe-lipepara-figitebisem.pdf
    • https://rebifigu.weebly.com/uploads/1/3/4/6/134663288/431829.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/setigafat/application_letter_format_tagalog.pdf
    • https://s3.amazonaws.com/fazujo/bajrangi_songs_kannadamasti.pdf
    • https://s3.amazonaws.com/jeponowon/29056746425.pdf
    • https://uploads.strikinglycdn.com/files/bbf8fe1b-e945-41f4-8ecd-4254e544db82/giwemewepojukinegupafexit.pdf
    • https://uploads.strikinglycdn.com/files/a5dfb193-7e65-4e70-9f74-ad038c64a2ad/mawalelejowabiro.pdf
    • https://static1.squarespace.com/static/5fbfcd6f403f5353fd8f68b6/t/5fc419a9173fb5383b23f478/1606687146141/62397436878.pdf
    • https://uploads.strikinglycdn.com/files/442b0f1e-8638-4fa3-b022-e7c596b78a19/33832422505.pdf
    • https://static1.squarespace.com/static/5fc2ebbeff13940aa24cd01f/t/5fc42427a97599144e7ac8e0/1606689833499/fafufudeziloxupiwas.pdf
    • https://s3.amazonaws.com/mejobu/sosusur.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012cdd.bin
61ac3a2517853f8570af6d800321e587d238e001b8dc767da9952c9c01f74063
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDD 4012 bytes
font_01_sfnt_off00013ada.bin
b2eb9e0e077699eb0bae8dc74b6eb8580bf0a88305f3464f2fc2d71e77771e4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ADA 5344 bytes
font_02_sfnt_off00014cec.bin
df1507536f31ffdfe05b4be4e87a2d6f7f2ae417250496cf371a8d20248bf672
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CEC 14360 bytes