Malicious PDF — malware analysis report

Static analysis result for SHA-256 026763431b41c9ee…

MALICIOUS

PDF

74.8 KB Created: 2021-03-24 01:13:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 6a2d66d0ff251ce2c8db652ea47b2316 SHA-1: 599622ce64099acdf436dafe636ad5200abb7ab1 SHA-256: 026763431b41c9eecba06a0dac90494b76a7be2a61b76542bb67170a0a3a53af
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to manipulate search engine results or direct users to malicious content. The primary URL identified is https://lozipotod.ru/award?keyword=human+body+organs+and+their+functions+pdf, which appears to be part of this scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/award?keyword=human+body+organs+and+their+functions+pdf PDF link annotation
    • https://jekodijup.weebly.com/uploads/1/3/4/4/134490718/fitavatarewaxe.pdfIn PDF document text
    • http://forexgeeks.net/podovewovixnm3i4.pdfIn PDF document text
    • http://abanca-electronica.com/38774701423t2bkw.pdfIn PDF document text
    • http://snt-br.ru/hitachi_mitre_saw_c8fse_partsr3vwc.pdfIn PDF document text
    • https://wiloropijevor.weebly.com/uploads/1/3/5/2/135299547/buteka.pdfIn PDF document text
    • http://criticcxck.space/vocabulary_words_for_9th_grade_s.a.tz9ctn.pdfIn PDF document text
    • http://artelamp.store/12243431014nso8j.pdfIn PDF document text
    • https://xinosete.weebly.com/uploads/1/3/0/9/130968926/8527335.pdfIn PDF document text
    • http://custits.space/18326451113c53vq.pdfIn PDF document text
    • http://joxexezukefu.22web.org/ben_hogan_five_lessons_review.pdfIn PDF document text
    • http://potaberukogox.66ghz.com/dipaponapege.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_45b2143f80dd4565be73c819e8e0e5fb.pdf?index=trueIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_46168082e581450b873fb4168a3b59b7.pdf?index=trueIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_38c56952d6b24ff3ac84724a5834f4be.pdf?index=trueIn PDF document text
    • http://barajolu.rf.gd/house_sitter_agreement_template.pdfIn PDF document text
    • http://tavupovasar.rf.gd/employer_branding_strategy_for_improving_employer_attractiveness.pdfIn PDF document text
    • https://b064d0e4-88d6-4b7e-8087-8ebf790fcba6.filesusr.com/ugd/ca32a8_9df2122257964944a14142608b28d066.pdf?index=trueIn 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_off0000e812.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE812 5740 bytes
SHA-256: 12d84124807618b1111b9e2548093f8dd44d4aab46c3c15b7f696dd477f28bb6
font_01_sfnt_off0000fb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB71 10316 bytes
SHA-256: 5e93a03be15345cd9352b7f92e1f0bb86451b965a794b6630182028f03de9073

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