Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb32adb80da3414…

MALICIOUS

PDF

83.8 KB Created: 2021-05-30 17:27:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 5297e30c8a98e0f63083ba546d0c8fb2 SHA-1: 2763862ffc3854156292c76c87766777d40c3e75 SHA-256: 9cb32adb80da341446e9326f4f5b5a15efb5d359a254c1982483308bb3832029
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO spamming operation. The embedded content, though heavily obfuscated, suggests an attempt to disguise the malicious intent behind a seemingly harmless topic. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/strik?utm_term=what+do+colors+in+dreams+mean PDF link annotation
    • https://togasiwivote.weebly.com/uploads/1/3/4/3/134370981/d4bca.pdfIn PDF document text
    • https://gefilatokakanor.weebly.com/uploads/1/3/7/5/137501249/jikalerekazodoxuni.pdfIn PDF document text
    • https://gatojodegapov.weebly.com/uploads/1/3/1/6/131637656/7745357.pdfIn PDF document text
    • https://janilunulosuga.weebly.com/uploads/1/3/0/7/130739392/siwazibafu.pdfIn PDF document text
    • https://tarokomilidifuz.weebly.com/uploads/1/3/1/6/131636676/1422554.pdfIn PDF document text
    • https://dabemevabun.weebly.com/uploads/1/3/4/4/134476179/dovadezuvodirorinoxo.pdfIn PDF document text
    • https://xomitemekebok.weebly.com/uploads/1/3/4/8/134881854/3289526.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
    • https://uploads.strikinglycdn.com/files/34238929-ba39-4f60-9007-b6997f701e5c/80526614854.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a15caee3-08c5-4def-a961-bab518be624b/dabelelamobemuwidavamo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5d39844-fae6-459f-a3e2-e62e3393998d/descargar_libro_phtls_9_edicion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6efcaae-a32d-4cff-b3ee-b0094ee10991/why_is_vicks_inhaler_banned.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc1c5345-db2e-4bfa-9c21-7954e30346a4/how_to_reset_a_non_programmable_honeywell_thermostat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af26883d-facf-4485-9f5d-c727758c63a9/11874872447.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d28e592-6b5c-43c6-b90e-251cdcedc076/27603659616.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5900a44-327e-4029-89c5-ebf7711d86d8/poker_218w_mod_teslacigs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea1532a8-64a2-4a24-9516-d60b44d8605a/aci_318-14_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff552dee-47fb-4de4-baad-11623bf15ce4/80192922118.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98cff92b-6906-44fb-86a3-5fb6e0c26d8d/when_will_after_we_collided_be_released_on_netflix_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8170820d-7c74-4118-8fef-e91cf16dd223/lozazideveviwumukoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ce12b1-5553-4f2f-bd3a-8df105885d00/88258869789.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4500f6ae-9e9c-4668-970d-9cde03bdfa07/les_miserables_staged_concert_2019_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8512d47-3669-4dc8-8cd6-3b65c3a93196/baganoganax.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_off0000fe8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8C 4980 bytes
SHA-256: f87269724b240c112b294b70ff1fbfe4678b68df0a3ff5ac77e8ea2b076bca74
font_01_sfnt_off00010f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F49 10712 bytes
SHA-256: 8329081802dfe1d5f0fdbb421bbdf98bb8f1fe0607325606553b0f37bb16f188
font_02_sfnt_off000133d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D2 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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