Malicious PDF — malware analysis report

Static analysis result for SHA-256 12676bef479de1db…

MALICIOUS

PDF

83.1 KB Created: 2021-05-09 05:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6469b8bccba1b69cdb0d1912543c573c SHA-1: b615170249135c0cd79467bf1716b94843d9a159 SHA-256: 12676bef479de1db2b9ad87b0cc429fba650678952ef7e2790d57a9ae75c91a8
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/strik?utm_term=how+much+does+prince+george+worth PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4490250/normal_601dfa9369056.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481509/normal_5fcf4d0e587ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465538/normal_5fe73fc82cb64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392651/normal_5ffe7bbf50634.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469640/normal_6003c0278c685.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_604cdb80a3bb2.pdfIn PDF document text
    • http://kapijozorok.22web.org/lo_invisible_azorin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393204/normal_60214d51038e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384296/normal_603b44a1237fb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zusapogadakafa.rf.gd/subirifemuzawoxojijiku.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/56085963324.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98a8b8e0-2a46-4696-a555-cde6a20ea233/joragizimopisetu.pdfIn PDF document text
    • http://nusavigosewu.epizy.com/pigemoxedarumovigu.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/what_is_the_salary_of_automotive_service_technician.pdfIn PDF document text
    • http://peromur.epizy.com/how_to_attach_file_in_yahoo_mail.pdfIn PDF document text
    • http://diguneleg.rf.gd/creative_thinking_files.pdfIn PDF document text
    • http://gigapexolazet.rf.gd/ranosowodugatakikate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c188e7ed-a8b9-4282-9dd9-2406677eebac/impressora_laser_brother__boa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbae6b4b-ed92-47d1-b136-9c244538fa42/98391592715.pdfIn PDF document text
    • https://s3.amazonaws.com/falufusu/the_secret_life_of_the_american_teenager_season_5_episode_17.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_off00010799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 5296 bytes
SHA-256: 60c27ab20d96669493d6998ddff0aff558a43f49d400a508f112340cd93f0a7a
font_01_sfnt_off00011989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11989 10932 bytes
SHA-256: 863f8611c0669f2feaac0092052906999c79a9bd965dca0c6acf5c4566e5efba

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