Malicious PDF — malware analysis report

Static analysis result for SHA-256 4deba77684ec3d60…

MALICIOUS

PDF

73.7 KB Created: 2021-03-01 08:10:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 4bd3f5191836babcb76de3f10256c253 SHA-1: 2e5f3885f84375ed5f15035aaddcdaa4fa824803 SHA-256: 4deba77684ec3d606e7ebf974f6a7a63e4a821a1ba765611ab0f58d4549a92c8
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm designed to obscure the final malicious destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically identifies this behavior. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links suggest it is intended to redirect users to malicious content, likely phishing or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/123?utm_term=trombone+etudes+imslp PDF link annotation
    • http://lorakuze.sportsontheweb.net/hp_photosmart_c4280_ink_staples.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/matthew_7_niv_bible_gateway.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/2007_yfz_450_review.pdfIn PDF document text
    • http://wikowezenitezo.medianewsonline.com/baldurs_gate_2_enhanced_edition_pc_review.pdfIn PDF document text
    • http://vulufinagi.mypressonline.com/whats_a_good_self_tanner_for_pale_skin.pdfIn PDF document text
    • http://najisemure.medianewsonline.com/vubafakazutaru.pdfIn PDF document text
    • https://kaperimivegorew.weebly.com/uploads/1/3/4/3/134371305/jazejojal.pdfIn PDF document text
    • https://lipopujowojirew.weebly.com/uploads/1/3/1/4/131408954/jidumomuvas-bepudenusib-xifulagabigedi-jusevobikif.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/18773216255.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/1873384.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
    • http://gilebufamefaf.rf.gd/ltlt_pasteurization.pdfIn PDF document text
    • http://mukelobader.rf.gd/informal_letter_format_for_college_students.pdfIn PDF document text
    • http://vizawenep.epizy.com/biofeedback_definition.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/likukixevuvisejepironuji.pdfIn PDF document text
    • http://tiriburud.rf.gd/17015083307.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/79631179187.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_off0000d6a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A2 4868 bytes
SHA-256: 40d85dd1b073c8f8883758eb039073db8cfdeecad2392231a4736d5b8d4d16a0
font_01_sfnt_off0000e701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE701 11600 bytes
SHA-256: 2c24612b116788e521d521374b6930f5071ed1fc08975011996bfb25bcf8e045
font_02_sfnt_off00010bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF8 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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