Malicious PDF — malware analysis report

Static analysis result for SHA-256 92de5bf16ad03d37…

MALICIOUS

PDF

74.8 KB Created: 2020-12-28 05:37:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2a5d9aa631c76ba8350ffb63aa8e4a5d SHA-1: b29233869e55cdbf4bdbebbb48550d34606799d1 SHA-256: 92de5bf16ad03d37b064356ccae737a7630a8c64fe981fa17c81f4fea2a204fc
96 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with a high risk score. It contains an embedded URI pointing to a suspicious domain, likely intended to lure the user into a phishing or malware download site. No scripts were extracted, but the PDF structure itself facilitated the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/strik?utm_term=dci+digital+career+institute+gmbh+hamburg PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420037/normal_5fa147bd8015c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389606/normal_5fc6aefd3e5b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450723/normal_5fd7a38a2494f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452594/normal_5fa62e9214681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486743/normal_5fb8aa84b78bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417408/normal_5fb4780f7bf4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462980/normal_5fbd79277762e.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/a10cc495-1d1f-4512-ade5-e79e62305c80/lipaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5db6fd3-a310-44cd-b97c-52f6e1d53928/gezusolitafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3d25546-908a-4c25-a4ca-30049f9e0f1a/gifesupun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/101f3583-bfd6-4f0a-9a11-ed558702e75f/sowagufarukorumabewagovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6202ac98-8cf9-4475-bacc-cfa8596fd0c3/lantern_string_lights_led.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84276ef5-5c53-429b-b479-4e0a8be86493/tuwok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe68a504-69fd-4cd5-8a56-130b5fedcab6/15327630259.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e437153-81d5-4ac7-8791-fb465ba9d88e/dark_souls_3_save_transfer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65b1926f-7d7a-40a6-adb7-cdfa6f070836/the_cemetery_club_script.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44cc3249-36c3-427c-8297-2bf9e27736a0/luwinut.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_off0000d804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 5264 bytes
SHA-256: 594c0b64cfb6ae951e5a88ab9624721d46428ad31fcbd346c33837fb96c974a1
font_01_sfnt_off0000e9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B2 11284 bytes
SHA-256: c17179a1706f2c5bddc46f3d6c8d20bd4a83220d72058b18139fcec4901282c9
font_02_sfnt_off00010ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF8 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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