Malicious PDF — malware analysis report

Static analysis result for SHA-256 3566d74968ca3032…

MALICIOUS

PDF

86.5 KB Created: 2021-02-27 09:37:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a17f0c74f4ccb1153cb5b06eaabb7493 SHA-1: ffef21b3f5dfced1a73e1d430fb6d85f6fb9b60b SHA-256: 3566d74968ca303211c773c85d5f0f13630d5c412f7f6dfce9b166ef0072ebc9
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it functions as a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to the use of disposable hosting and multiple distinct hosts, reinforcing the malicious nature of the links. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jumiwimov.ru/wix?keyword=the+guide+summary+gradesaver PDF link annotation
    • http://tameeniraq.com/tylex_30mg_bulamiglo.pdfIn PDF document text
    • http://galoomer.online/pipalet29ub.pdfIn PDF document text
    • http://lejunuzegakikuv.mypressonline.com/thomas_calculus_12th_edition_early_transcendentals_solution_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454055/normal_600f5a54db955.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374178/normal_5fd10195dfc01.pdfIn PDF document text
    • http://zisuroto.mygamesonline.org/libovemufanexuzow.pdfIn PDF document text
    • http://stavki-na-sport.site/94413548388by1xw.pdfIn PDF document text
    • https://cdn.sqhk.co/loberutebe/hbgee4K/atomos_greek_definition.pdfIn PDF document text
    • http://brettlockhart.com/xokodumetowfgh1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425772/normal_601f938df0e90.pdfIn PDF document text
    • http://jabilevij.mypressonline.com/425437860.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/how_do_you_calculate_extra_credit_into_your_grade.pdfIn PDF document text
    • https://lugonejiborin.weebly.com/uploads/1/3/5/3/135336075/jefaxumupipi.pdfIn PDF document text
    • https://cdn.sqhk.co/ruvazilu/iaiebWR/planet_war_total_war_wiki.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
stream_004_off00011dd4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11DD4 2060 bytes
SHA-256: c4fce0d7f3afc5ae5aa8adcab11eb4d8b749c2e620dc05487f27ec12cd99d980
font_00_sfnt_off00010be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE2 5316 bytes
SHA-256: 5179fd0a6435366b14b09127374de934ef2313d5f2f8202fa03b36d88f7ad6bf
font_02_sfnt_off000127b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B7 10860 bytes
SHA-256: abdf2a39a89cde848f093a83d19d713ccefc761ea2c4bc680bdb19c863e8d00b

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