Malicious PDF — malware analysis report

Static analysis result for SHA-256 a613efb8cc3d4398…

MALICIOUS

PDF

74.7 KB Created: 2021-04-04 04:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 193c20e44fa324ca4a3fb62e3c75d0a1 SHA-1: 1c82dc4c118dbbaa7b921d39f154339daad738d8 SHA-256: a613efb8cc3d4398e1067a05314a01e2b8db5147db3a346ee5a66a9d3a2a3f5c
96 Risk Score

Malware Insights

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

The file was identified as malicious by a machine learning classifier and ClamAV, with the latter specifically flagging it as Pdf.Phishing.Trojan. The PDF contains an embedded URI pointing to a URL that appears to be part of a phishing campaign, disguised as a thermostat manual. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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/strik?utm_term=white+rodgers+digital+programmable+thermostat+manual
    • https://cdn.sqhk.co/zebapomiz/hgdKWa6/anime_gacha_simulator_rpg_apk.pdf
    • https://cdn-cms.f-static.net/uploads/4450728/normal_6037e99ec42b9.pdf
    • http://ninomut.sportsontheweb.net/gewakudiku.pdf
    • http://openchambre.xyz/jewakapovususuwuxwaxzf.pdf
    • https://cdn-cms.f-static.net/uploads/4370319/normal_60167ca85f8c7.pdf
    • http://rofuxipof.mywebcommunity.org/59981582620.pdf
    • http://dvigatel.guru/programming_in_computer_science_courses_after_12thzke6t.pdf
    • http://topstudy.fun/byomkesh_pawrbo_movie_songslvclv.pdf
    • https://cdn.sqhk.co/jakatote/cyEU1AH/folowal.pdf
    • https://cdn-cms.f-static.net/uploads/4365998/normal_602fc246b82b9.pdf
    • https://cdn.sqhk.co/notenirikev/id5whcE/scary_movies_on_hulu_october_2020.pdf
    • https://cdn.sqhk.co/bokirebi/dO2yaha/kerbal_space_program_game_xbox_one.pdf
    • https://cdn.sqhk.co/mejomusajob/NXydjcc/kanevikexitasa.pdf
    • https://cdn-cms.f-static.net/uploads/4455208/normal_604673bd10428.pdf
    • http://jobs-ingenieur.best/masterbuilt_sportsman_elite_electric_smoker_reviewsvs45n.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://7f06b679-e14d-4525-8955-d56a7cf6f710.filesusr.com/ugd/79e5df_e6ca598d336f4fb2b119ca337c95bf2f.pdf?index=true
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_8f2ccbfd2bf8400bb8055a9cb29ab99a.pdf?index=true
    • http://munakazoxan.epizy.com/romeo_and_juliet_1968_movie_download.pdf
    • https://ca3ec1ac-6ff7-4c8f-ae0f-86a30d86e335.filesusr.com/ugd/3615fb_c48e5c536ce748c886aec320458b4f04.pdf?index=true
    • http://wolobugoxew.myartsonline.com/96172389061.pdf
    • https://ff536187-e25a-4bd2-965b-ff1113cf40b0.filesusr.com/ugd/bfcccc_5bee9716f43841fba2e3996f4316b2bf.pdf?index=true
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_b10d32e72d0f495cbd3219e173a5d591.pdf?index=true
    • http://virojokezof.rf.gd/osteoporosis_elsevier.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_off0000e789.bin
f7731646f5b0138b64e3b08bcca8b2a84d46e3023231f70d1a2300c25150e3e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE789 5528 bytes
font_01_sfnt_off0000fa2d.bin
2d90ce6257ef953d0eec6ed0a8b3010d0f7ca6e4a70bb59f4c5b90282037d708		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2D 10412 bytes

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