Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c40a347f3ce82c2…

MALICIOUS

PDF

80.2 KB Created: 2021-03-20 04:58:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 67a15a3f5336590cdeb005cdb115f939 SHA-1: 59bf9d5c4e2e07912b3a0628e4e20d4fc1ac3d06 SHA-256: 3c40a347f3ce82c24b5bb71a765c989ab6c7d1425dd94daca07937e93be732f2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to benign-looking documents, but one prominent URL leads to a suspicious domain associated with phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to a phishing site or download further malware. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users through deceptive content and external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=how+do+we+measure+organizational+effectiveness PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464995/normal_6035a3cfdd089.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421217/normal_600dcf3072a5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486213/normal_5fd7d4119fb1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377095/normal_602db3c63340e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459629/normal_6054ff15c8856.pdfIn PDF document text
    • https://cdn.sqhk.co/nadokikado/eA1yjhg/my_bt_account_please.pdfIn PDF document text
    • https://cdn.sqhk.co/sozodumupof/ehjjXzG/weather_radar_freehold_new_jersey.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/x2ijuUq/lejaz.pdfIn PDF document text
    • https://cdn.sqhk.co/rejibebadit/3mgchhC/nebod.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://s3.amazonaws.com/kuxegu/bewigaxuzonulon.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/devevikotefetunaw.pdfIn PDF document text
    • https://s3.amazonaws.com/musokejixami/avaya_1408_instruction_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/rapesapabanapelek.pdfIn PDF document text
    • https://s3.amazonaws.com/bisute/2766764712.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/zoxonir.pdfIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/facebook_apk_para_pc_windows_7.pdfIn PDF document text
    • https://5ee0d2ad-6486-47ce-ab7d-0e7b2bae4193.filesusr.com/ugd/bc0d1e_247989f3270e425bac34a5a063fc9a4b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/52773074046.pdfIn PDF document text
    • https://041bbef9-4dd1-43b9-9ec7-2672afc16ec1.filesusr.com/ugd/686814_1de0deb975e44b0e842e95a862bd4d4c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jixerubowi/bomberman_1987_game_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/why_does_my_shark_vacuum_not_have_suction.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_off0000ef7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7C 5384 bytes
SHA-256: bfb260d7afd0c66ad644612e3b9df39936824c3f4d76e137de8452b402e5ca68
font_01_sfnt_off000101d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D3 10328 bytes
SHA-256: 9e624c3ce568b726723729570bb2e688a0576111caaf791ce2e903e2f2e23cec
font_02_sfnt_off0001253d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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