Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb498d94f6dd7382…

MALICIOUS

PDF

74.5 KB Created: 2021-04-18 17:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 842e5b9ea5b5e30c6e5a691b2bf3cf24 SHA-1: 563cdec6e311188cd9f6c8b7990c53512b95719f SHA-256: bb498d94f6dd738249d75cf9739782563eabcac0e3ab3a08a73f00d95aeb9d6c
184 Risk Score

Malware Insights

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

The PDF contains embedded links and a URL in its body text that direct users to malicious domains. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK specifically flags a link to 'crophysi.ru' as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+open+a+first+alert+carbon+monoxide+alarm In PDF document text
    • https://cdn.sqhk.co/nugilatunu/gijjeVX/8252507883.pdfIn PDF document text
    • http://kolunikikirade.22web.org/mcgill_gpa_scale_arts.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/jghcFUK/goal_translation_english_to_french.pdfIn PDF document text
    • https://cdn.sqhk.co/torazanopuni/MrieOhb/rulisuja.pdfIn PDF document text
    • http://pozesex.iblogger.org/42048617137.pdfIn PDF document text
    • https://cdn.sqhk.co/fedugaxoloz/JxYjagi/space_crew_review_metacritic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494877/normal_60196bbd489f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371248/normal_602a38ac9ba2a.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/xafaxotaful/why_wont_my_lg_dryer_start.pdfIn PDF document text
    • https://69f6cc44-9198-4e41-bafa-43503dba92bf.filesusr.com/ugd/dec231_459cbcfa134844948ec731177d8527cb.pdf?index=trueIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_4853a3484d9b442db99554e0bde673cf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kuboki/93218495320.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/68371108603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc299fff-2a1f-4edb-be53-cc7c0d1ad9e3/saraxotot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdba660b-e85b-441c-aacc-649309098624/meade_etx_125_photos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36958405-0fe3-456d-b81c-dbb4ab39e231/gexewuvefik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97f052e0-8474-4f78-abfa-9149be3c5214/ziwudinaga.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/california_food_handlers_test_answers_quizlet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d16694d-5ed7-496c-9a6e-d30063d93555/matlab_for_engineers_5th_edition_answers.pdfIn PDF document text
    • http://jasikadavasa.epizy.com/auslan_sign_language_alphabet.pdfIn PDF document text
    • https://f8340159-69ce-4309-ac43-521e9a8475b4.filesusr.com/ugd/bc0b97_f271d359edc642ac8974c2f2ebd6a755.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_off0000e536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE536 5564 bytes
SHA-256: 53e052fd774b0dada30bba3948b5f18dad3043c3c4e7692f8f1d0184e0de4332
font_01_sfnt_off0000f819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF819 10728 bytes
SHA-256: 2cc1f4abbef6c472f287ba01ffd2c8c619a10f9d66032ca4c9a9c77ae9a90d51

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