Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5826c33b4e1615a…

MALICIOUS

PDF

66.9 KB Created: 2020-12-17 07:34:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe77e6a351064a4a6241e3b490f7cd42 SHA-1: ec2708cfcad08925adab2312b862f6cf989309ee SHA-256: f5826c33b4e1615afbee7bfe0b010bf9c62c76f31e8bd7c4c7ec2ff812002596
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links suggests an attempt to redirect users to malicious content.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=left+center+right+card+game+instructions
    • https://kusudojisopev.weebly.com/uploads/1/3/4/7/134774064/turefobopimi-rifob-sagamimejilel.pdf
    • https://wilixutisew.weebly.com/uploads/1/3/4/0/134095986/31a77c148c0.pdf
    • https://cdn-cms.f-static.net/uploads/4461761/normal_5fd1bab6537d3.pdf
    • https://tidosivapozagul.weebly.com/uploads/1/3/4/3/134390518/6216314.pdf
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/fanuboluro.pdf
    • https://lezafopiga.weebly.com/uploads/1/3/4/6/134628758/pemidexovuzasozakul.pdf
    • https://wikabolodaj.weebly.com/uploads/1/3/4/6/134648749/944f3dc7fa1.pdf
    • https://lubozukutiximik.weebly.com/uploads/1/3/4/4/134472848/zokedisasuvut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fc520ee6609fd0ee7ace750/t/5fd69d95ab1a676c7297dc8c/1607900566117/84755708844.pdf
    • https://static1.squarespace.com/static/5fc6ac03085bf90c0e256974/t/5fc89eb66031f47386243ea3/1606983351255/glitter_bomb_traps.pdf
    • https://static1.squarespace.com/static/5fc5355c24b06a7eb31bb18b/t/5fc63302e18c5c478ece22f0/1606824711469/lenuzegazepapi.pdf
    • https://uploads.strikinglycdn.com/files/9fb160e6-8530-436e-98ef-509f3a7923bf/lukenomifotusapexime.pdf
    • https://static1.squarespace.com/static/5fcdfed041ec4a2cc0e015f4/t/5fd05b9c5ec17a4c668f7123/1607490460662/mugomerar.pdf
    • https://static1.squarespace.com/static/5fc36642bd14ff0dd2ac8625/t/5fcb48be1ef6d1662fec64d0/1607157950676/sisters_hospital_buffalo_new_york_phone_number.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_off0000c8a9.bin
3b57ab0f41c9104df32c6d5a8cafa72f5969eb1cd9800379b657680cd92c3c3d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A9 5344 bytes
font_01_sfnt_off0000dab3.bin
74b0d16d708c9dd19bb1472a4281b22913c9c8b66f80bf8da4e6ae255d553e0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 10580 bytes

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