Malicious PDF — malware analysis report

Static analysis result for SHA-256 683aca490b811589…

MALICIOUS

PDF

67.5 KB Created: 2021-04-04 12:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e58982bc82fc29889d3cd656ee8e39aa SHA-1: 8783c610f0ede0fb62d15c7a43ec59729ab96c0a SHA-256: 683aca490b81158976407c19c487c9d3db0fde6b72f7ed291d22ae285cb1fdda
116 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document is flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains an embedded URI pointing to a suspicious domain, which is likely intended to redirect the user to a malicious site. The document body, though heavily obfuscated, suggests it is masquerading as an installation manual to trick the user into clicking the malicious link.

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
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://baarspo.ru/123?utm_term=apsystems+yc600+installation+manual PDF link annotation
    • http://golosa-spasibo.ru/stream_3d_movies_apkw6c12.pdfIn PDF document text
    • http://infonewstravel.com/schlumberger_aptitude_test_questions_and_answers_ppt2wex7.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/9hiZjiT/lorojunizurorumu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393041/normal_5fce9042b6dfe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495065/normal_603558b3231c5.pdfIn PDF document text
    • https://cdn.sqhk.co/fajaleniwa/ejhqies/42809178937.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/jBngjJL/fantasy_battle_wood_elves.pdfIn PDF document text
    • https://cdn.sqhk.co/baluwofuk/hhigcie/romeriwarejekez.pdfIn PDF document text
    • http://adyga.site/12526487756ciein.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412774/normal_5fe07b58c4926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465136/normal_603ae6f86d56d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a5d3f69-a10a-4b4b-bfe1-b0807d36dacc/how_to_put_exponents_in_ti-83_plus_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64271b29-89cf-4db3-a40c-28159e5d1151/64361762024.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eb91c3b-2373-474a-abda-d24256506182/gixixunasetowedusifimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da25a664-15dc-4efe-b3e2-f93990f20b33/wofowadosaro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8731ac33-f0a2-46c7-ad2a-fd835123c1cc/40559740043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff1720a0-0697-4ff2-b31f-d802624917e7/33443875924.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b71af6ad-18f7-4ce4-b184-2107ffdfc963/58957008277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2cf533f-e648-4132-b5ea-11decb1d3099/yajurveda_sandhyavandanam_in_telugu_mp3_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57251939-60bd-42c8-8593-5d5cf8437975/71133751839.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e07cf134-9cfd-426e-b0be-1343700dd741/10774382004.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A4 5368 bytes
SHA-256: 37ca5f509cbb342073113fc2baad006fe5e29969f06716bf1d345cfd2a2f08a9
font_01_sfnt_off0000dbe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE0 10676 bytes
SHA-256: 8a78d55ed5a7358cd581a1f3b297e1be39113ae6cab3da8bd17a110b7ca1ae00

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