Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8428cf2a28ee30…

MALICIOUS

PDF

79.0 KB Created: 2021-03-29 21:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 457a61d436536006926f7ee3f1eb4616 SHA-1: 5899c4bf6e349ab80b10050b5cb5aab8d13da5c9 SHA-256: aa8428cf2a28ee30c5d959cd99941a53218f748691f7f2ff631d9a8c529a2c4a
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains an embedded URL that appears to be a lure, disguised as assembly instructions for a desk. The presence of embedded URLs and the overall detection suggest it's designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=mainstays+l+shaped+desk+assembly+instructions
    • https://cdn-cms.f-static.net/uploads/4445325/normal_60561051b6e4b.pdf
    • https://cdn-cms.f-static.net/uploads/4426944/normal_600f5d70c7cff.pdf
    • https://cdn.sqhk.co/pesasotiro/Vuhejah/planetside_2_max_player_count.pdf
    • https://cdn.sqhk.co/vejanozugova/AjjgjyQ/55144111160.pdf
    • https://cdn.sqhk.co/xolanikipiz/idhhYhi/amazon_kindle_app_for_mac.pdf
    • https://static.s123-cdn-static.com/uploads/4403266/normal_5fca3e7732e28.pdf
    • https://cdn-cms.f-static.net/uploads/4448096/normal_5fd3b03dd1a36.pdf
    • https://cdn-cms.f-static.net/uploads/4493905/normal_604b100a37ced.pdf
    • https://cdn.sqhk.co/kizofapekeku/VyOqGLp/nekarigojakudaguzukix.pdf
    • https://cdn.sqhk.co/gapalagabig/jehjjPJ/4915022425.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_2d667a32f56b42f3ba198301235c5f24.pdf?index=true
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_ac43be97367c448cb71514b142153f7d.pdf?index=true
    • https://s3.amazonaws.com/ninasivol/how_much_will_extra_credit_raise_my_grade.pdf
    • https://uploads.strikinglycdn.com/files/3d977803-d6a8-42a4-be9d-ba5311ccda78/are_tv_remotes_interchangeable.pdf
    • https://uploads.strikinglycdn.com/files/4ff4190d-f0fa-49e4-8661-8c00e8c07b2d/2482984239.pdf
    • https://s3.amazonaws.com/xakapudakadu/victoria_secret_show_2018_performers.pdf
    • https://s3.amazonaws.com/penale/dot_matrix_art_definition.pdf
    • https://uploads.strikinglycdn.com/files/e80217d4-86ff-41b1-9626-ebc8997756da/71327096629.pdf
    • https://s3.amazonaws.com/gixawetopoli/38711219307.pdf
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_e73df11382164c37a7cfe8065b0c1944.pdf?index=true
    • https://s3.amazonaws.com/bifamomove/cartoon_animation_maker_apkpure.pdf
    • https://s3.amazonaws.com/dobikasukavu/jotun_hardtop_xp_application_guide.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f464.bin
0d8965a3b7f09971e60ab0926832a35c3b5ca56e5be919f7599700b4e1af53ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 5624 bytes
font_01_sfnt_off0001075f.bin
4e7ff4df85d371dcc7635ddf69e6731f093734af8acce848d4c11c62151380da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1075F 11600 bytes

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