Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f3fa0ab6b95b05d…

MALICIOUS

PDF

74.2 KB Created: 2021-03-05 09:01:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: da4c4580b745ac964c3d80ba660c5d59 SHA-1: ab60cdca7d8c02aa78f4bee880a45ae84ebd1be6 SHA-256: 1f3fa0ab6b95b05d74cff21af3bd98f70343a2fcde6629aa612c1177e83ac27a
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content or phishing sites. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/award?keyword=rt-ac68p+reset+login PDF link annotation
    • https://cdn.sqhk.co/toralapiluw/jjChjc2/20_animal_facts_you_didn_t_know.pdfIn PDF document text
    • https://niromovikusuzu.weebly.com/uploads/1/3/4/6/134651616/5615444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_6038e213a41e8.pdfIn PDF document text
    • http://choosenews.space/basic_automobile_engineering_book_freepyih3.pdfIn PDF document text
    • https://cdn.sqhk.co/givikofuf/diahgEz/washington_huskies_hockey_jersey.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422161/normal_60215e88651c4.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/pozisonowefuveguvoba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365539/normal_5fefd4cb44d27.pdfIn PDF document text
    • http://indital.space/imf_world_economic_outlook_report_2020n1ghc.pdfIn PDF document text
    • https://zekabijixakosu.weebly.com/uploads/1/3/0/8/130813896/kimeg_vitowugesoxiwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_de8368f3a9074526b271ec22d3814c42.pdf?index=trueIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_5a57556e2c0f47ab9f898a54ac52e322.pdf?index=trueIn PDF document text
    • https://316b94d8-f1eb-4552-9621-e6dada6029ed.filesusr.com/ugd/4b675a_e919db4cb7f14d2b9bf5f5cd4646b8fe.pdf?index=trueIn PDF document text
    • https://856cb5e6-6c81-45ce-9604-b57907a15cd2.filesusr.com/ugd/cc3ca9_9f3ea27a1d4e4bb593ce85de59d20b5d.pdf?index=trueIn PDF document text
    • http://kawerulim.onlinewebshop.net/31248435616.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AB 5276 bytes
SHA-256: 557cb859eed9c03974acc6783e7c2de5b16e1ea451a067197f62d39ae5e25698
font_01_sfnt_off0000ea99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA99 10184 bytes
SHA-256: 72f42493d9f30aa673d0ece2f2efe6b88b2ab5443d1a85ec2d785ee2c6a67caa
font_02_sfnt_off00010d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D70 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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