Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97bafa69a71558f…

MALICIOUS

PDF

79.4 KB Created: 2021-03-17 01:16:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0a1e6b8d6cfb62b6f8a53aca5f7f8f41 SHA-1: 2a9f26bd46770a53ed561be89dd394f11bada669 SHA-256: a97bafa69a71558fc6bb37aca4f09cff8cfd5d7ef53efa38799773e6df4fe82f
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spam campaign. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The embedded URLs likely lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/wix?keyword=ancient+egypt+worksheets+free PDF link annotation
    • https://cdn.sqhk.co/bazexolareja/i6Njdhb/13373273823.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/ihuWEjb/fly_ash_bricks_manufacturing_project_report.pdfIn PDF document text
    • https://cdn.sqhk.co/tejosepu/hecD30h/top_up_diamond_murah_via_id.pdfIn PDF document text
    • https://cdn.sqhk.co/xipapotug/gFcwJHM/cute_girl_avatar_maker_online.pdfIn PDF document text
    • http://fabifux.22web.org/wiziru.pdfIn PDF document text
    • http://madusotiju.22web.org/clean_burnt_pot_with_dryer_sheet.pdfIn PDF document text
    • https://cdn.sqhk.co/detatakev/Zja0jGd/13008905063.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/f9he2hf/piano_online_classes_in_hyderabad.pdfIn PDF document text
    • https://cdn.sqhk.co/mipekakiri/4ygfcii/7896007671.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/f3jjX4V/blaze_and_the_monster_machines_party_supplies_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/tofigidukug/jgSjjMS/16111721544.pdfIn PDF document text
    • https://cdn.sqhk.co/tamupoto/ggidvjg/starz_power_cast_member_dies.pdfIn PDF document text
    • https://cdn.sqhk.co/famuxina/aghcxji/jewodadebejitupimunipib.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kevakop.epizy.com/86779267949.pdfIn PDF document text
    • https://064d663d-f6b2-44cf-a6ad-083da5f315e5.filesusr.com/ugd/77eba6_c9a5b6f82f464aff9e5bf184acde5a9b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nowokil/10005615632.pdfIn PDF document text
    • https://6997f972-013f-4c6f-ac95-4179ba17a557.filesusr.com/ugd/549e1a_dbb809ee97c94615a146fdb37b5bb57c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tugumeb/free_sheet_music_christmas_duets.pdfIn PDF document text
    • http://fopekexu.epizy.com/34548189868.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/96192359575.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/maze_runner_the_death_cure_cast_full_movie_download_in_hindi.pdfIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_79c3ffda8e6f430abe2dd68b173a5460.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/starbucks_coconut_milk_nutritional_value.pdfIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_f14091725950425a92aa5f99ab17b0f6.pdf?index=trueIn 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_off0000f82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82F 5284 bytes
SHA-256: f93d56d90e6f3d29ba4f7d6e94f1501aafff3fa341ee0460116aaff46a86751c
font_01_sfnt_off00010a4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4D 10476 bytes
SHA-256: 2fcadd2eab0865ef2e360869392310bc3b9ac9bcc29aa39c747c15c794a3f547