Malicious PDF — malware analysis report

Static analysis result for SHA-256 47123f0289da794b…

MALICIOUS

PDF

77.1 KB Created: 2021-05-22 11:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a9ae21132dc23e1bd282d243fc4af757 SHA-1: b649e4c5487b1abc347e48443ff502923c85c84c SHA-256: 47123f0289da794b464862f0b8aa683cdd624b21e123257b887d2d7c9960e7c7
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a link farm, directing users to a suspicious URL (https://nipisod.ru/strik?utm_term=what+are+the+8+characteristic+of+life). ClamAV detection and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan. The document body, though truncated, suggests a lure related to 'characteristics of life', which is likely a pretext to drive traffic to the malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://nipisod.ru/strik?utm_term=what+are+the+8+characteristic+of+life
    • https://pofekivivefuron.weebly.com/uploads/1/3/5/3/135339802/10851f9.pdf
    • https://zedowami.weebly.com/uploads/1/3/1/6/131637063/5688261.pdf
    • https://fofalada.weebly.com/uploads/1/3/5/9/135968840/1062737.pdf
    • https://fozipapuratub.weebly.com/uploads/1/3/6/0/136088586/varolizi.pdf
    • https://zipufalazuviw.weebly.com/uploads/1/3/1/8/131856517/eb1430c6f8ea0.pdf
    • https://nonejekorozu.weebly.com/uploads/1/3/4/1/134108542/jonaxesulavi-kozubaf.pdf
    • https://dubanivexog.weebly.com/uploads/1/3/4/3/134331992/pubibopudusam_mavix_mujofitobotajed.pdf
    • https://taduvovu.weebly.com/uploads/1/3/1/8/131871704/281805ccb80b96.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fasomusogapovi/baposikurirudevafu.pdf
    • https://s3.amazonaws.com/sazomo/78681273703.pdf
    • https://uploads.strikinglycdn.com/files/1b675c56-52de-4762-9c18-9403f90f593b/gabizikevowidegenofibig.pdf
    • https://uploads.strikinglycdn.com/files/c0e2b993-3d94-46e7-b5a4-847012ca15be/vowejetuvanetaja.pdf
    • https://s3.amazonaws.com/fapaga/anatoly_fomenko_new_chronology.pdf
    • https://uploads.strikinglycdn.com/files/c31a0149-0255-4c44-9e3d-adb6f80bd40a/static_and_dynamic_verbs_list.pdf
    • https://s3.amazonaws.com/tedowafomaru/83998121065.pdf
    • https://s3.amazonaws.com/poresi/wimelaviruwis.pdf
    • https://uploads.strikinglycdn.com/files/3d5408f6-2459-46e0-8952-a0dcc81d3d26/zizusiduno.pdf
    • https://s3.amazonaws.com/xuzed/how_many_carbs_are_in_a_taco_bell_chicken_soft_taco.pdf
    • https://uploads.strikinglycdn.com/files/e3e82de3-7542-4a2f-ad1c-7c16deb23185/what_masters_can_i_do_with_a_philosophy_degree.pdf
    • https://s3.amazonaws.com/wovugi/chinese_textbook_rewrites_bible.pdf
    • https://uploads.strikinglycdn.com/files/6910d48c-6034-418c-b68b-7304a9ad9bc9/jaxarurorovad.pdf
    • https://uploads.strikinglycdn.com/files/6b557fca-2d7b-468d-bcec-f0dd9d38c079/49027322279.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_off0000efef.bin
8eb5c62446f9e37c9812ee42096fc5e4d5537aada178f41e1c9ac66eae319caf
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEF 5176 bytes
font_01_sfnt_off00010192.bin
3b1da53a292b4c56c12aaa70f54bdf8e6ee601ea08a9e3186011c94fdca19e96
pdf-font-stream PDF embedded font (sfnt) at offset 0x10192 10844 bytes