Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7749a11a86fd9f7…

MALICIOUS

PDF

69.4 KB Created: 2020-11-24 12:20:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 62ba6444d67e115d82e5ce3f9e405b50 SHA-1: 79799275d5cd6763f9de9989c7caea84b57cdf09 SHA-256: f7749a11a86fd9f7d24dabc1e50cb4408ac247dc25f13e64f59a16122e8e5e0a
156 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by multiple heuristics as malicious, including a critical ClamAV detection for Pdf.Phishing.Trojan. The document body, though corrupted, suggests a lure related to an air conditioner manual. The presence of a large number of external links, including one to 'trafffe.ru', indicates a phishing or SEO link farm attack pattern. No scripts were extracted, but the overall structure and heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful sites.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/strik?utm_term=mitsubishi+air+conditioner+manual+rkw502a200
    • https://juvuxoxeziw.weebly.com/uploads/1/3/4/3/134313380/rirumelal.pdf
    • https://dowezepuxaku.weebly.com/uploads/1/3/4/4/134463959/kedosamodamizuj-letuduwido-kawojezisidifuv-wetigur.pdf
    • https://cdn-cms.f-static.net/uploads/4446016/normal_5fa4c116316f5.pdf
    • https://nimopiwezu.weebly.com/uploads/1/3/4/7/134700470/wazebifid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/duzexefemosaxe/gorabana.pdf
    • https://uploads.strikinglycdn.com/files/7c6579e1-c95e-4e2c-af2c-62d291ae9673/amsco_algebra_2_and_trigonometry_tex.pdf
    • https://s3.amazonaws.com/rivazixexuguri/21935741686.pdf
    • https://s3.amazonaws.com/nalifij/destino_sur_hotel_spa_de_montana.pdf
    • https://uploads.strikinglycdn.com/files/21835d46-ca83-45b8-be08-f1b0924c0b82/coraline_-_rsum_par_chapitres.pdf
    • https://s3.amazonaws.com/juvuwaterexaf/63214907792.pdf
    • https://s3.amazonaws.com/xanebavifamopez/kowomepejugovajuwikuzuwan.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_off0000d08b.bin
e893b4712e9e74773077be6d5cb43e1ef10d7505dbb39c00805c3bd7694ddc73
pdf-font-stream PDF embedded font (sfnt) at offset 0xD08B 5880 bytes
font_01_sfnt_off0000e47f.bin
3719b58e13759c657561da3fa7d5b8945b76c491a5de6cc4a3f0ad322aae555a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE47F 10664 bytes