Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc1d68e0f48bfd6…

MALICIOUS

PDF

132.7 KB Created: 2021-04-06 15:35:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 539abebc4416057fbbc3fb66672939df SHA-1: a8534f704515b3ae8294e5947b70168a8f330f59 SHA-256: 5dc1d68e0f48bfd654570e20174cf3ce5e0979b8a165f13ca08b4bc8fb0ae3e7
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware or facilitate phishing. The embedded content, though heavily obfuscated, appears to be part of this link farm strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/award?keyword=fundamentals+of+communication+systems+2020+edition+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382772/normal_60032d0f96c03.pdfIn PDF document text
    • https://dadixuva.weebly.com/uploads/1/3/4/0/134018012/50ba97890.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/8Ghiegf/runescape_classic_map.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465250/normal_6047855c369d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387242/normal_5ffb537759114.pdfIn PDF document text
    • https://pitatulepuz.weebly.com/uploads/1/3/2/3/132303378/sariso.pdfIn PDF document text
    • http://pivojowemetobiv.mywebcommunity.org/48645116143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391327/normal_604a4e5b8ae69.pdfIn PDF document text
    • http://zodelem.mygamesonline.org/hp_2620_printer_price_in_uae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402504/normal_6019f125f01b5.pdfIn PDF document text
    • https://nonejekorozu.weebly.com/uploads/1/3/4/1/134108542/4267396.pdfIn PDF document text
    • https://cdn.sqhk.co/vazoguzo/bEhcQdU/minetest_server_mods.pdfIn PDF document text
    • http://nebatomefov.scienceontheweb.net/accpac_accounting_software_tutorial.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_71bf93cab98247f7be328e335db98fa6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nimuwet/51361965859.pdfIn PDF document text
    • https://486a928f-df87-4682-b39c-9199637d78f9.filesusr.com/ugd/982a49_254b34307d7f4b9eb4b6e28dd76f4553.pdf?index=trueIn PDF document text
    • https://8ab1a2d5-e5b1-44c5-a28c-e09959565f0d.filesusr.com/ugd/eb712c_8119acfa8f504c34b679337d845666dd.pdf?index=trueIn PDF document text
    • http://zakefuki.myartsonline.com/rowusidemobomufegajev.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/gomorrah_episode_guide_season_4.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_off0001c53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C53D 5724 bytes
SHA-256: ad90a10c92db0ca1d9344627ffdb9c0dd780b419a54ca3ddb39fd72a2a1c84a1
font_01_sfnt_off0001d8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8C7 13492 bytes
SHA-256: 502895faa7eeeccb7e11f3b698413bb0cdcb014b53f70619b1aa31b8952a8d44

Open this report in the interactive analyzer, or submit your own file for analysis.