Malicious PDF — malware analysis report

Static analysis result for SHA-256 3971feb0639775b3…

MALICIOUS

PDF

89.2 KB Created: 2021-01-03 15:53:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 007c96e8f7caf7cb47eef414c4aacfa4 SHA-1: 16cafb8ac1dc5f844a769988a7919d3eb7315b46 SHA-256: 3971feb0639775b3ddf120d7574f3659c29412fc4bef6fa05b8c3bf0aa292e30
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a "PDF link farm" designed to host many PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. The document body, though heavily obfuscated, contains keywords related to an "apk update", suggesting a lure to download potentially malicious software or visit phishing sites.

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 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.
  • 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://trafffi.ru/wb?keyword=toon%20blast%20update%20apk PDF link annotation
    • https://cdn.sqhk.co/judebivon/DAHTEge/porosepi.pdfIn PDF document text
    • https://cdn.sqhk.co/duxapotor/Yz2FLXo/62191742390.pdfIn PDF document text
    • https://cdn.sqhk.co/bovokolel/jgigjjg/resident_portal_login.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/916761cf89a.pdfIn PDF document text
    • https://cdn.sqhk.co/gixejefi/P91nrha/98707633607.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxumududu/szyieij/zegunafedokixigobupux.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/12e2b906-9960-436f-8923-e0771bf4cd83/cisco_9300_switches_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3a5b5bb-ad63-4cbd-96a4-df114f68169f/vopotizebimejafijonavi.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/warusabipabowasafijodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e492efc-03ae-4662-81cd-1d11aa36b47e/construction_safety_and_health_program_requirements.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80249938-d12c-4cbc-b28b-b949a7216775/98802568181.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/12419745015.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19a56c6e-9ea4-4b5b-a94d-358cd398ac9f/wutigegofolovo.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/fashion_design_web_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04db5493-7c44-42d8-8bb6-31b534102bf0/textos_para_corregir_faltas_de_ortog.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_off000116ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 4844 bytes
SHA-256: 666a33e0ffa68c3b088b4702e0bf8ee254500a315cb0b90742d0409af8281b2a
font_01_sfnt_off0001276e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276E 10020 bytes
SHA-256: 58ec3ca02d0b197cbd4bfb16324cfd4c6208fcd0c9ca6313409ffcaea785efac
font_02_sfnt_off000149bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149BB 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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