Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4db867c1a82141…

MALICIOUS

PDF

78.4 KB Created: 2021-05-18 00:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 73e60619190350dc1c31fcec49801a8d SHA-1: bb84760f8bc338351cdf4960323641ce6460de53 SHA-256: ad4db867c1a821415706d757fe490316bf5683d99bb3648aaaf7a0bab202663d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a primary one pointing to 'gimoguvi.ru', suggesting a phishing or malware distribution lure disguised as game codes. The PDF's structure and numerous links indicate it functions as a link farm, likely to obfuscate the true destination or to spread traffic across multiple disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=roblox+magic+elements+reborn+codes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481166/normal_604bb5dc57ee7.pdfIn PDF document text
    • http://bamiduvunaw.iblogger.org/71165307695.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480891/normal_60487859b89d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482188/normal_6057fa7784b1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382406/normal_5fe1840790d27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448558/normal_6061c385e2e73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427506/normal_60149cb875822.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409103/normal_5ff40d9acc947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502920/normal_5fe9176778751.pdfIn PDF document text
    • http://siwetogiwiko.iblogger.org/holy_anorexia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387408/normal_5fd622c887004.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473379/normal_603227f0b6e53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370073/normal_6049845243548.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/jifedefujodu/babok_guide_v3_free_download.pdfIn PDF document text
    • http://xugomoxuniwemo.rf.gd/accelerated_reader_ar_quiz_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/polk_audio_surroundbar_2000_troubleshooting.pdfIn PDF document text
    • http://godemesefiw.epizy.com/94921734774.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/24870222414.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/easycap_application_software.pdfIn PDF document text
    • http://majerowi.epizy.com/b_pharmacy_colleges_list.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/avery_template_5366_publisher.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/california_math_mcgraw_hill_grade_6_answer_key.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_off0000f032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF032 5476 bytes
SHA-256: 8ac85989fcdaaf3c932f8e142f273290b017080b20b52c376e93231bb2100af4
font_01_sfnt_off000102bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BB 11660 bytes
SHA-256: f91aa5046e77e187db78ae4adfcaea717a3e4c92d72d0f23352c6006e4e88994