Malicious PDF — malware analysis report

Static analysis result for SHA-256 9237af1e69603487…

MALICIOUS

PDF

87.6 KB Created: 2021-06-10 08:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: aece42a2d5cd5030f9a9b64ad30f707f SHA-1: 33164cedccc09d5baa0be0aa7cf584f2219d93d6 SHA-256: 9237af1e6960348715393da34b5f34e291d933ec656c3df7b383d01385eecf4f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of multiple external URIs, including one with UTM parameters suggesting a phishing lure, points towards an attempt to trick users into downloading content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further suggests a tactic of using disposable hosting for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://archism.ru/pbw?utm_term=7th+std+maths+book+english+medium+pdf+download PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://guxofesam.pbworks.com/w/file/fetch/144881205/2d_shapes_worksheets_for_grade_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b9149e5-c0b0-4610-87c1-55ca2cb0b401/mozuzagurunu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90195a1c-6fbc-422b-ad12-d701033d791e/jufitizelepivejepuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1a43cd6-2404-412f-8ad9-d54e69f6deef/10194127253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/791a23c0-47f4-4b02-92df-3afcddf26ee4/legend_of_zelda_manga_legendary_edition_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6ce4bf3-5708-4d00-b8b2-b72f0f943e13/34267250519.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86938f1a-33dd-4026-a66f-cff700c01907/gorukesowifejajal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/727c963b-2352-4a1e-a9d5-a3012031a2e1/adding_mixed_numbers_and_fractions_unlike_denominators_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13a3e54b-553e-473c-84df-ec44c22ec4c9/why_does_my_wireless_thermostat_not_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7f36228-967e-4f14-80fd-43ca041da799/8167779813.pdfIn PDF document text
    • http://nilanom.pbworks.com/f/what_is_molecular_bond_theory.pdfIn PDF document text
    • http://tugewuvog.pbworks.com/f/phonetics_and_phonology_difference.pdfIn PDF document text
    • http://katafuzum.pbworks.com/f/82248173674.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/637052bf-3df2-4ae2-9e8c-67cc19e3d4ba/how_to_stop_metal_bunk_beds_from_squeaking.pdfIn PDF document text
    • http://zezimin.pbworks.com/f/jesepinosowimo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c62cb72c-6895-4976-bcb4-c8bf4f56270c/photosynthesis_worksheet_answers_biointeractive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72d7079c-a3df-4170-b9c8-3e2f56bee3c9/worx_electric_chainsaw_oil_leak.pdfIn PDF document text
    • http://jujirafamena.pbworks.com/w/file/fetch/144890466/banuxopagadu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d680138-57d5-472e-8a02-61acbca594f9/peporumeg.pdfIn PDF document text
    • http://gozuwef.pbworks.com/f/what_are_the_difference_between_meiosis_and_mitosis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b8bc179-317b-44cd-be89-be5a06ed382d/81311091397.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 5520 bytes
SHA-256: 821c6283bfc801cdf756761e4cd7ca7a94d614233ca6a9ce88ff856fc592a49c
font_01_sfnt_off00010261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 4828 bytes
SHA-256: 5f1c0b49487488d682ced999bb1f6d5e15b36d5e2bd9c771a0b7e1d75ecc82dc
font_02_sfnt_off0001130c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130C 10720 bytes
SHA-256: e1f37eb74ec98ef049d52e77f049911cd05615b0c53ac19e70eb1e98e60014c3
font_03_sfnt_off00013771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13771 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
font_04_sfnt_off00014570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14570 2792 bytes
SHA-256: 0ae6aaa7f9ff25c9f8375576a0001b294d82a321c4f24c342a5eb47a6f7cea8d

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