Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2fcb25bc1ddbb68…

MALICIOUS

PDF

115.1 KB Created: 2021-03-18 13:40:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 44b31c571245302f88ee4ebbbdde1984 SHA-1: 5b05cd44ba81ee7b3a57fcfce5a6199402481999 SHA-256: a2fcb25bc1ddbb681ce70728450914fa214c38c9eb90565c0bb2ab618cb7420b
166 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing and trojan activity. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack, potentially instructing the user to decrypt a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://bologen.ru/strik?utm_term=delphi+radio+hard+reset PDF link annotation
    • https://cdn.sqhk.co/kidimezamos/NhathjI/elite_motors_of_renton.pdfIn PDF document text
    • https://cdn.sqhk.co/kolazapikib/pgjieja/faxelosof.pdfIn PDF document text
    • https://cdn.sqhk.co/lamajemomu/b0ygijd/smartthings_lock_status.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411932/normal_60184023ca517.pdfIn PDF document text
    • https://cdn.sqhk.co/sisadenev/VHOXghF/68867916918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495841/normal_60523d1e2c6a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483072/normal_6000d11f86256.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/ObyiiBX/pro_football_games_today_saturday.pdfIn PDF document text
    • https://cdn.sqhk.co/kekoseni/eNjgQ9j/monsters_approaching_ut_fan_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370063/normal_6037d34d43cd8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/secret_neighbor_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97a2df2e-b6ed-483e-9657-49a5372f605c/.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00a63809-eac1-4f31-9a58-576eaf7b99d2/how_to_write_a_movie_pitch_letter.pdfIn PDF document text
    • http://boxomivesamazi.epizy.com/how_to_take_mbti_test_for_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c329575f-289d-43ab-981e-c67c3a892362/74922947664.pdfIn PDF document text
    • https://s3.amazonaws.com/fikuvine/how_to_uninstall_a_viper_alarm_system.pdfIn PDF document text
    • http://tegofiv.epizy.com/spirited_away_sixth_station_guitar_tab.pdfIn PDF document text
    • https://s3.amazonaws.com/midizaxopazeji/5542417225.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/biodyne_performance_schwinn_220.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f483c5d-4c76-42ab-ab0f-359829d425bb/65253012376.pdfIn PDF document text
    • http://sobojagi.epizy.com/66758789348.pdfIn PDF document text
    • http://lutatiduz.epizy.com/technical_documentation_template_word_2010.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/zutogadotufaf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000170b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170B2 3672 bytes
SHA-256: 2cbbf0485b5de64e073181373d6cbadf34dd4d23564927bf8655caaff111f436
font_01_sfnt_off00017dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DC5 5044 bytes
SHA-256: f91903b57c72a84cb5eb929bb784fabea4bac12aeaaa48383298e54002916445
font_02_sfnt_off00018ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EE5 15952 bytes
SHA-256: 9614eb723c9b7822b26b3f1fbd1e3a5ae6582307252dcb5ed6659fbd0453fd40