Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43ef6b75a7bee74…

MALICIOUS

PDF

41.3 KB Created: 2020-11-01 04:01:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: 2c4bca7f17113ee241d078f682272fe9 SHA-1: e18532c15f0d26017438981b944505a9e0e5d363 SHA-256: e43ef6b75a7bee748f65b29f92e35865260efe3e6f079d48df598b26e0441e9a
174 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to potentially malicious redirectors or link farms, as indicated by the PDF_SEO_LINK_FARM and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. The document body text and embedded URLs suggest a lure to external content, likely for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/pify?keyword=columbia+county+clerk+of+court+ga In PDF document text
    • https://ruwalabipuges.weebly.com/uploads/1/3/4/4/134465281/piwaxubobifases.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414678/normal_5f99dc2f61265.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5f8896bc2d06c.pdfIn PDF document text
    • https://kodupupagunoj.weebly.com/uploads/1/3/4/3/134314474/juvupigag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/6513/4244/files/porter_cable_150_psi_air_compressor_instructions.pdfIn PDF document text
    • https://s3.amazonaws.com/fodose/83983486815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7666e11c-f9ab-459f-be26-9ea002a30999/22579127451.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/angel_giraldez_masterclass_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0482/9085/7121/files/lidosisi.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/lake_county_marriage_license_indiana.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0506/4087/9777/files/nexgrill_heater_replacement_parts.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0481/3838/7607/files/85689412967.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6146/9599/files/zejewabojopi.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_off0000625f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x625F 5232 bytes
SHA-256: 34c6fcb5f07a7b4137cd1ecf5cb23818ef15a2c42a2c9d05e0eebdc6884c79aa
font_01_sfnt_off0000742a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x742A 10580 bytes
SHA-256: 6536908896798c1dee25067d9eb68dbba8e0ce80cbbf6619424cfa3e7c5d351c

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