Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf16600e661d3b8…

MALICIOUS

PDF

85.3 KB Created: 2021-03-23 03:05:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 32436a4dc08900df416efc1a392d8df9 SHA-1: 0d69f400556c7b89d039955d5a685f2dfb660dba SHA-256: dbf16600e661d3b8defd2780f1740ad51d2d56c76c2d90564ad6f092830a4627
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Electrostatics physics lab answers', indicating a phishing or malware distribution attempt. The presence of external URIs and the link farm heuristic strongly suggest the document's primary purpose is to redirect users to malicious sites.

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://lozipotod.ru/123?utm_term=electrostatics+physics+lab+answers PDF link annotation
    • http://bazubufawe.22web.org/20926828178.pdfIn PDF document text
    • https://cdn.sqhk.co/joninopi/tlyja4P/konegesoxajinawolutidepal.pdfIn PDF document text
    • http://bufaturofonoko.22web.org/79691161203.pdfIn PDF document text
    • https://cdn.sqhk.co/takivelalam/hfiiEZg/download_game_survival_on_raft_ocean_nomad_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/nakizenonetu/hvijjgM/xivajusu.pdfIn PDF document text
    • http://fezanabuxa.22web.org/wusefexoruve.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/mjeibJR/tejajagowezimivid.pdfIn PDF document text
    • https://cdn.sqhk.co/pixazizaze/hejhLij/redbox_new_releases_sept_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6045ac67-af7a-4059-b65c-dca0ab5128d9/36107529526.pdfIn PDF document text
    • http://pazatirademe.rf.gd/sukilo.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/70411556260.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b5d35f7-3919-46cb-bccc-f4a1890a7f09/what_is_the_role_of_a_trustee_in_a_church.pdfIn PDF document text
    • http://noxewun.rf.gd/subject_verb_agreement_rules_in_bangla.pdfIn PDF document text
    • http://pijebikedil.epizy.com/tewuvagijixesuwipowujono.pdfIn PDF document text
    • https://e791dc30-71fd-4519-a75e-453748eb9c32.filesusr.com/ugd/8a5fcf_835aab424aa641d189c1e239c22dd2f2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/riot_point_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47e11d5d-e32b-44aa-afeb-24642e3a1db3/januwiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/399ba193-79f4-46b3-980d-c8d9237568af/element_carbon-14_mass_number.pdfIn PDF document text
    • http://tifalupu.rf.gd/asme_y14_5_general_tolerancing.pdfIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_62976a7ad8ee4f76806d79dcda4ed8ff.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_off00010ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE9 5312 bytes
SHA-256: 51e72b1cf810eaaf135db270377140c84b4716e4085d7905c94ef5c4c6314fbb
font_01_sfnt_off00012107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12107 11480 bytes
SHA-256: c6afebec22203b7216f1c4d7d13bebf0650a6b4a1ba37cdf9fd6f76df3c866bd

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