Malicious PDF — malware analysis report

Static analysis result for SHA-256 64c40f2accb35e3e…

MALICIOUS

PDF

122.4 KB Created: 2020-12-11 19:07:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33e49c3cc4f4a8a2508eeda017fa441f SHA-1: 765ea9419b8499cf0619e9ca1c4385aeca2a9c50 SHA-256: 64c40f2accb35e3e3815aa8c4cf22cda70d30d9c5632b387e28c74228df3dc87
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to known malicious redirector infrastructure. The heuristic PDF_SEO_LINK_FARM indicates a large number of external links, suggesting a link farm for SEO poisoning or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffmen.ru/aws?utm_term=java++for+windows+32+bit+free
    • https://luvepuxoworusoj.weebly.com/uploads/1/3/4/6/134660421/kodinukiwekijobafis.pdf
    • https://bofufawikifof.weebly.com/uploads/1/3/4/2/134235483/b1ee9d2a5e00444.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/labitajaxatufib/fensa_certificate_template.pdf
    • https://s3.amazonaws.com/marimejerebo/67424189966.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf54e9eaf37e3b6492af09/1606374634146/vevixarekekodulasife.pdf
    • https://s3.amazonaws.com/pivetuzadujo/bhagavad_gita_malayalam_file.pdf
    • https://s3.amazonaws.com/fovezewi/du_admission_2019_ug_form.pdf
    • https://s3.amazonaws.com/vekodupiwarobi/stanislaus_county_fair_livestock.pdf
    • https://s3.amazonaws.com/satuja/44631710678.pdf
    • https://s3.amazonaws.com/xazarujokemus/rom_acolyte_leveling_guide.pdf
    • https://static1.squarespace.com/static/5fc13c726609fd0ee793905a/t/5fc3df059d7936484004be3b/1606672134156/41477511894.pdf
    • https://s3.amazonaws.com/gowebabuxogiro/6209751276.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_off0001a183.bin
706010853f6df0ab9205788de469fb36b638bb60ccf76b67be352fc48928a468
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A183 5448 bytes
font_01_sfnt_off0001b433.bin
196fd887fdc2f0a313782bbcc80e6ce27387750acdab5d57ef2dc1827ff075ca
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B433 11404 bytes