Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a0b0de2d36677f…

MALICIOUS

PDF

83.8 KB Created: 2021-06-11 10:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5626cb6c5bea875419da49adcac592b2 SHA-1: 04f41e1d5c5cd979f5b653b140996964534cb3d6 SHA-256: b5a0b0de2d36677f309d1bddabc3d29be8fa8591c6408eb61e6484c5b4655efe
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded URI pointing to 'crewmak.ru' with a query parameter suggesting a software download lure. Although no scripts were explicitly extracted, the PDF structure and the presence of external links are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crewmak.ru/pbw?utm_term=pascal+wager+download+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414173/normal_60118fb118877.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502493/normal_600369b58360e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381544/normal_5fdff8579877c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466143/normal_602b5ac34adf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475194/normal_5fef9c44ce5cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370555/normal_5fd9bdfdeaddb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379487/normal_60359999e80fa.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/236f57a6-fffb-4f4d-84ec-82c5dabd7b10/91220620841.pdfIn PDF document text
    • http://gipomebepate.pbworks.com/f/musewakepo.pdfIn PDF document text
    • http://sujagajo.pbworks.com/w/file/fetch/144686229/58558075533.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10c72828-2378-4963-979d-14101b5b1441/super_pose_book_japanese.pdfIn PDF document text
    • http://godekazonigi.pbworks.com/w/file/fetch/145123782/film_4k_streaming_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa9b4e7c-ae8d-4a61-b81b-ac412fdb58a9/93269371716.pdfIn PDF document text
    • http://fisagibop.pbworks.com/w/file/fetch/145096050/pokemon_johto_rebirth_gba_rom_download.pdfIn PDF document text
    • http://varulemenel.pbworks.com/w/file/fetch/144619167/who_is_the_best_blacksmith_in_witcher_3.pdfIn PDF document text
    • http://fevuxowina.pbworks.com/f/how_do_i_adjust_the_temperature_on_my_lg_inverter_refrigerator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e04fe7e0-02be-41be-8755-a45098809e05/husqvarna_455_rancher_parts.pdfIn PDF document text
    • http://duvetemeb.pbworks.com/f/hellcat_games_unblocked.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/why_is_my_hard_wired_smoke_detector_beeping_no_battery.pdfIn PDF document text
    • http://pinurakus.pbworks.com/w/file/fetch/144608124/grade_six_activity_sheets.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9B 5400 bytes
SHA-256: 3d27ae769eb0d23cba6f97998615ec2b6efa514b3a439072c334ef4b000c3778
font_01_sfnt_off0001011a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1011A 12560 bytes
SHA-256: f75e393116b4219fdf9f0e17119b9cc03d76a5bd7a8c4c5cc93143dc066e62d0
font_02_sfnt_off00012aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA5 16068 bytes
SHA-256: 12bdfdd26b42687ed6d6e4673084773943fc64d80ea302008a05158b1f99f3df

Open this report in the interactive analyzer, or submit your own file for analysis.