Malicious PDF — malware analysis report

Static analysis result for SHA-256 520b077a0b5526c7…

MALICIOUS

PDF

76.6 KB Created: 2021-03-27 21:23:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40346f58e7a9ca4e8a846b8d21952eac SHA-1: 7aeff82c377b669c40b65ad078e00374ce896a7d SHA-256: 520b077a0b5526c7657740b87a7fed3aa07af9f91243bf84842996ae934b85bc
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute traffic to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xezojetit.ru/strik?utm_term=how+to+sync+hampton+bay+ceiling+fan+remote
    • http://kixurox.getenjoyment.net/how_to_change_battery_in_clicker_garage_door_opener.pdf
    • http://xoxosedefoxadu.mygamesonline.org/99712481756.pdf
    • http://kevebofuru.medianewsonline.com/vefetesinilum.pdf
    • http://novazeku.mygamesonline.org/nomenclatura_de_cetonas.pdf
    • https://moxalabukeziro.weebly.com/uploads/1/3/4/7/134772199/jinalaxobipuji.pdf
    • https://sazomoravevak.weebly.com/uploads/1/3/0/9/130969829/mukonalapu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_d161fbc741d3495bb6930e351a80e860.pdf?index=true
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_2513eb7425104b9fbf1363079327a33b.pdf?index=true
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_c11636a236f14e9681e8304deee60c1b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/81e1431d-0dbd-4c19-982c-c2ba7a2d363a/captive_meaning_in_english.pdf
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_11f8fb88352d4b999c0522709a6c8edc.pdf?index=true
    • https://uploads.strikinglycdn.com/files/97f052e0-8474-4f78-abfa-9149be3c5214/ziwudinaga.pdf
    • https://722d0b64-886f-48d6-ad1d-3f240095bb95.filesusr.com/ugd/07f6b3_754e5e3fc8834bd8b55004daab246567.pdf?index=true
    • http://liroporuki.myartsonline.com/mulojame.pdf
    • http://sopavame.onlinewebshop.net/62337936966.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_off0000edab.bin
db6a7094941b79e1d93019b0ebf3edd14dff967bfa40dbc5e4578b3291fe2286		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAB 5724 bytes
font_01_sfnt_off00010114.bin
62935e0124869afe762afbea6977071cd90f76df2aec29d6511954183e028c75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 10700 bytes

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