Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a20b0f7706b8bd…

MALICIOUS

PDF

78.7 KB Created: 2021-04-10 06:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ba88d68e5481119fbfaae292f65c2aa9 SHA-1: a95cf03c15994ae37e80cbca2cd8be33714733ec SHA-256: 36a20b0f7706b8bd14df9d0e60bdab0bd60ea57227df014061852559b76cf6f6
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL pointing to 'golowaki.ru' which is presented as content about building muscle, a common lure for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, likely for further exploitation.

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://golowaki.ru/strik?utm_term=can+you+build+muscle+with+just+bodyweight PDF link annotation
    • https://cdn.sqhk.co/dogilijesiwu/yc9ghia/20483167730.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/ogigeU6/class_of_2017_football_recruits_espn.pdfIn PDF document text
    • http://rent-nout.site/84_charing_cross_road_movie_imdbz2x5n.pdfIn PDF document text
    • http://hellesypakk.online/5519365896583777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449996/normal_60224b84a04a4.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/gHp76jd/ring_roll_balls_3d_print.pdfIn PDF document text
    • http://fitit.space/openstax_university_physics_volume_3d83i8.pdfIn PDF document text
    • https://cdn.sqhk.co/vunelebu/gfheeie/hd_video_player_apk_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_603a457fd5d4c.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/78b7edd6-c615-4d9a-8f96-00bbea8dd1a3/sivapuram_tamil_mp3_songs_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d80097-172f-45d0-8a1e-93b53aab40eb/90281598094.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0474a4fa-1625-40f8-bb35-03a68f3e43c1/95875794218.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e5cb38-b05c-4f53-afca-4c7e1a71fb43/baby_girl_winter_outfits_3-6_months.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fac34b2-062c-480d-9000-efd901048bfc/molecular_formula_of_hydrogenated_palm_kernel_oil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f20dd134-6a31-4e18-bf8d-0f0f6f01e3fc/ti_89_titanium_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ff151b7-4218-4e85-aa3b-07f38a0a6016/what_is_meaning_of_islamic_art.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e5ec4a9-b694-4eed-89e0-9a0b1ab51b26/latest_skyrim_update_xbox_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f4477b4-e976-4a01-aa3b-659e8f2ac71b/simile_worksheet_grade_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a5fd35-939a-4d2c-aa7a-45e369c48ca3/forerunner_920xt_replacement_band.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_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 5572 bytes
SHA-256: 3bc592525d05cca998baa215d0c0d0d6d2a2bfdfd156285553111a0e0d8176b3
font_01_sfnt_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 10964 bytes
SHA-256: 973c2465ecabe2e3d21751c67d1f2ec11f71a252fca10d3537f9c55902d070d2

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