Malicious PDF — malware analysis report

Static analysis result for SHA-256 aeaf84e26391ab9d…

MALICIOUS

PDF

65.4 KB Created: 2020-11-22 16:51:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a428e4b372336bb5bec46bd428ced60 SHA-1: d476e076bbd6141802a6e4f41b6d70d685d0b961 SHA-256: aeaf84e26391ab9d5b39d83261efcd32baf005d538af252248524605b2d72140
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one specifically identified as part of a link farm, suggesting a phishing or SEO poisoning attack. The PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/123?utm_term=stationary+distribution+markov+chain+calculator
    • https://suvenalopevoku.weebly.com/uploads/1/3/4/5/134510495/wexapu.pdf
    • https://dirigesibujov.weebly.com/uploads/1/3/0/9/130969991/xodimopulepibu-xagizemudi-bofin.pdf
    • https://rutepoger.weebly.com/uploads/1/3/4/5/134509459/dewesidikibotomud.pdf
    • https://zadujemerumid.weebly.com/uploads/1/3/2/6/132695269/suluriteligalimatus.pdf
    • https://zezojafoxivofed.weebly.com/uploads/1/3/4/5/134528913/8051681.pdf
    • https://mupawume.weebly.com/uploads/1/3/4/3/134365579/wokofufas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b132241e-0f5b-4e08-837e-70e31f99dd17/imperial_armor_8th_edition.pdf
    • https://s3.amazonaws.com/migivewuwe/96369618789.pdf
    • https://uploads.strikinglycdn.com/files/2c245cba-6a9c-4e43-a706-096cb7e3d433/last_king_shirt_mens.pdf
    • https://s3.amazonaws.com/fejatepudopito/72801130418.pdf
    • https://s3.amazonaws.com/gonuxiwela/sapamexajinorasusoxo.pdf
    • https://uploads.strikinglycdn.com/files/77920737-8fd7-489a-bee4-d0e1eb423041/kesimatolulixojupavuwib.pdf
    • https://uploads.strikinglycdn.com/files/6682e30c-05af-434d-b17a-58744cf09953/samsung_nx58h5600ss_lowes.pdf
    • https://s3.amazonaws.com/jamokaroxoj/kuxuradufuwinarilati.pdf
    • https://s3.amazonaws.com/gumagabu/dodugajidisovoj.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_off0000bf25.bin
92f108a7644f0a11a9beefd76bc7ebd0901af9c272f31405de8bacac17aa7d4d
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF25 5648 bytes
font_01_sfnt_off0000d23e.bin
d9fb4da812640f2af164f10c47080850cf34caeadbb509368b04819480e75282
pdf-font-stream PDF embedded font (sfnt) at offset 0xD23E 11344 bytes