Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd4839a55278665b…

MALICIOUS

PDF

77.7 KB Created: 2021-03-30 06:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b82a4bcac127035a1df2c171d4b43069 SHA-1: 735209df1d7f8ccebfbf41f30c08538615d54e31 SHA-256: fd4839a55278665bc9b821b921ad7976643898e2d0fa97300a81d57f3b6a6f53
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to trick the user into visiting it. The PDF structure and embedded content suggest a social engineering lure, possibly related to fake awards or exercises.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://dafemum.ru/award?keyword=barbarismes+exercicis+pdf
    • https://static.s123-cdn-static.com/uploads/4447252/normal_5fcd884ce530c.pdf
    • http://sixobenuzapezi.iblogger.org/how_do_i_reset_my_haier_portable_air_conditioner.pdf
    • https://static.s123-cdn-static.com/uploads/4375528/normal_5ff98b1652639.pdf
    • https://static.s123-cdn-static.com/uploads/4426262/normal_5ffc09fb4565b.pdf
    • https://cdn-cms.f-static.net/uploads/4417205/normal_60113bde32a98.pdf
    • https://cdn-cms.f-static.net/uploads/4405195/normal_6039155b6ef34.pdf
    • https://cdn-cms.f-static.net/uploads/4445754/normal_60306cada10c1.pdf
    • https://cdn-cms.f-static.net/uploads/4423453/normal_604870ad86946.pdf
    • https://cdn-cms.f-static.net/uploads/4463552/normal_601e00b812304.pdf
    • https://cdn-cms.f-static.net/uploads/4449193/normal_602474e33cf94.pdf
    • https://cdn-cms.f-static.net/uploads/4377697/normal_6056323cbd527.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_443e8f00be7347ef811ac8b74fd677a1.pdf?index=true
    • https://926fca10-1439-4adc-b819-38dad5327275.filesusr.com/ugd/26d6d3_95901bd9c57846f99566e8d20ca8798a.pdf?index=true
    • http://bexalaxawuwe.rf.gd/40197507074.pdf
    • https://a52dd608-e7dd-4d50-8005-e0fd7a3896b4.filesusr.com/ugd/43d2fc_94d89a1b1cd04b188f60d2f11606a470.pdf?index=true
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_77050906e71a43ccab49e8c667e8ea7a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/86dec992-868d-47c8-8e6f-c1e74a6f396b/mainstays_metro_desk_instructions.pdf
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_9cae04f99cbd48a89c86c09099cf0a70.pdf?index=true
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_7c723280218240c0bd8109aa9f011971.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a55d6b1d-1459-4004-b4fa-6dd30487a6d8/55667135096.pdf
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_3385edc7eff54440bd4ee22dd03adc09.pdf?index=true
    • https://uploads.strikinglycdn.com/files/02639514-2f3b-4ac3-ad55-bac7260e4976/dune_buggy_las_vegas_family.pdf
    • http://zinurefel.rf.gd/how_to_adjust_valves_briggs_and_stratton_17.5.pdf
    • https://uploads.strikinglycdn.com/files/3ebd73bc-c728-4e2a-bf23-f4db9237a522/hisense_40_inch_roku_tv_review.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_off0000ee39.bin
5816b8a7da29222b99ac2c30bc65a2816343795639e5de40aaaa9ce290f3d1f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE39 5528 bytes
font_01_sfnt_off000100eb.bin
74a31af246e41bb865d74bd47020c562aa6568ab15aecf24e5fae9f3300466e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100EB 12344 bytes

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