Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf15760aafeb980…

MALICIOUS

PDF

146.3 KB Created: 2021-03-19 12:33:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f040a1b7eb14de339bb053bc41bd1a95 SHA-1: ba40409f9cc6786d1f9a56f1e4047fa651a672a9 SHA-256: fcf15760aafeb9801c10da8fc2a5597db97ab8d9a1a9b61e0d466ac528d4d304
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by both ML classification and ClamAV, with a specific detection of 'Pdf.Phishing.Trojan'. Heuristics indicate it functions as a link farm, containing numerous external URIs pointing to various websites, some of which are hosted on disposable domains. The primary purpose appears to be directing users to these external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bologen.ru/wix?keyword=%25D8%25B3%25D8%25B9%25DB%258C%25D8%25AF+%25D8%25A7%25D9%2585%25D8%25A7%25D9%2585%25DB%258C+%25D9%2587%25D9%2585%25D8%25B3%25D8%25B1 PDF link annotation
    • https://zewerigavuj.weebly.com/uploads/1/3/2/6/132681779/1786642.pdfIn PDF document text
    • http://kukushpa.fun/how_to_clean_aprilaire_electronic_air_filteru9nes.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/Wiigigh/azamara_pursuit_cruises_2021.pdfIn PDF document text
    • https://cdn.sqhk.co/nuduniguwufo/Sahjojf/virtual_beggar_mod_apk_revdl.pdfIn PDF document text
    • https://cdn.sqhk.co/dovoxukeni/ifOAzhi/how_to_download_xfinity_stream_beta_on_firestick.pdfIn PDF document text
    • https://giwelexe.weebly.com/uploads/1/3/0/8/130814055/basezi_zekobo.pdfIn PDF document text
    • http://1xbet-registr.site/4410522706583i6p.pdfIn PDF document text
    • http://copyrightproblem.com/54273508549wibao.pdfIn PDF document text
    • https://kizerovum.weebly.com/uploads/1/3/4/7/134747257/mizezuguveroka.pdfIn PDF document text
    • https://cdn.sqhk.co/kovixileta/dOjdjdp/thronebreaker_walkthrough_golden_chest.pdfIn PDF document text
    • https://cdn.sqhk.co/gimexigerub/3oT9MNF/caller_id_call_blocker_pro.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwevini/jWcgehi/setuladujerunojoxiku.pdfIn PDF document text
    • https://cdn.sqhk.co/zawitagevute/NHRjjgg/12369760927.pdfIn PDF document text
    • http://citimart.online/didoki7ezjj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2cfcb734-ec62-4cd9-b61c-03d4762ad765.filesusr.com/ugd/a891c0_012d6d7b21cd4ddaa339446818d8100b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e58ea0a-ed12-48c3-9f4b-55911d1b1ad3/holmes_mini_tower_air_purifier_amazon.pdfIn PDF document text
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_143fe5eb99e848af8c72264f2a0c5d73.pdf?index=trueIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_bad9a3de5b3d4639919c04708b9f457d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2240054-8ff7-4731-ac37-08192430fce9/30627419059.pdfIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_69e2cc7394ff45b0b88b3a83dd6690bf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/394be905-751e-4c2a-abb2-6dde2869db53/34869571837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0e52223-1a3d-4c5c-a267-b0ab668b55e8/black_and_decker_40v_cordless_trimmer_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e314c6d-f0b2-4f58-8946-a06f9ef0566f/55774275411.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001fc21.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1FC21 34488 bytes
SHA-256: c1567119fb499e8b56f837ab2afd51fab6f3f5d22e9b07a9c910765283ea4f9e
font_00_sfnt_off0001b3ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3AD 4068 bytes
SHA-256: 60a2d6429503f7a4ddaf98851b2b9757a5da54dd45bab0a2aed837b7042708be
font_01_sfnt_off0001c18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C18C 9440 bytes
SHA-256: f2a37001ac8e1eb6699df265c9d2706a0d891ed5d19c1f539e6437d4a8e84d62
font_02_sfnt_off0001e20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E20D 17584 bytes
SHA-256: 1435d833b317d3941b804e768bf81a7c18d60803073d2354d9fce8649725c637

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