Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0526e88aa962aad…

MALICIOUS

PDF

80.7 KB Created: 2021-04-17 13:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 325aee2f6617ac02998d9bfa0cd966e7 SHA-1: 2186bf5f7fd96731720ed9208f8d2a07bad03928 SHA-256: c0526e88aa962aadd7dce642f8ae0d16f605a0f704277a6bedc7c7a5db176e8a
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 pointing to disposable domains, indicating a link farm designed for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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.
  • 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://vilenefex.ru/strik?utm_term=how+to+repair+panasonic+microwave+oven PDF link annotation
    • http://goodshopsales.xyz/what_to_eat_on_warrior_dieto07ad.pdfIn PDF document text
    • https://fojiwuduz.weebly.com/uploads/1/3/5/3/135309278/goxesuwinigita-rumolaboki-vasuni.pdfIn PDF document text
    • http://nanolenka.xyz/beats_solo_hd_headphones_reviewanqum.pdfIn PDF document text
    • https://cdn.sqhk.co/mesafovojifo/DjfCkTK/visadajuxepuzawajafiv.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/18085018583.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/hfRjfsJ/disney_princess_toddler_dress_up_trunk.pdfIn PDF document text
    • http://lupelisizi.medianewsonline.com/xurezer.pdfIn PDF document text
    • https://tuzokoluxalof.weebly.com/uploads/1/3/1/3/131382257/vamulagubinag.pdfIn PDF document text
    • https://mibarepazakeme.weebly.com/uploads/1/3/4/6/134685426/149c82872.pdfIn PDF document text
    • https://cdn.sqhk.co/zezovajav/ohjT5qs/5198575546.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0e75ab8e-f6a1-4360-bef2-1d94e06fde4e.filesusr.com/ugd/c0518c_da07aac9019f402db1dc5b168136a677.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/chrissy_teigen_recipes_cravings_2.pdfIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_1716b25b1eef4790bca2f33d55e489e2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sitok/angel_of_death_movie_2018.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1E 5160 bytes
SHA-256: 7205469d8abd5fc28d1aa0e7024957d64bfa0993fc3d0b06cde4054a1052eb2e
font_01_sfnt_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 11092 bytes
SHA-256: d67ca459fd0aba07fd4fb9cd68306e6af5295e93b0fc8ca950bb2aed3ea55d77

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