Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8791b62ebf13a5…

MALICIOUS

PDF

73.3 KB Created: 2021-06-08 07:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fa6bd77da8ca283ce1758a48f526896e SHA-1: 55268e5590128b13a7f4ae467d349ae720dae00d SHA-256: ce8791b62ebf13a5c9cccf1c87a1414505848def1126cb1a23c61cdaa1519558
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains numerous external links, many pointing to disposable hosting, and is designed to appear as a service manual to entice users to click through. The primary malicious activity observed is the creation of a link farm, likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://synerhu.ru/pbw?utm_term=husqvarna+automower+450x+service+manual PDF link annotation
    • https://zuvimigiga.weebly.com/uploads/1/3/4/5/134586735/texuranufo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479435/normal_601f34d958474.pdfIn PDF document text
    • https://vagoledos.weebly.com/uploads/1/3/5/3/135320004/napubarupekufujesix.pdfIn PDF document text
    • https://puzalanenezow.weebly.com/uploads/1/3/4/6/134693659/8560202.pdfIn PDF document text
    • https://gasupajo.weebly.com/uploads/1/3/4/6/134624661/be92d82ff09a9f.pdfIn PDF document text
    • https://sizuxemonip.weebly.com/uploads/1/3/4/3/134315948/sanubirawobo_bubub_datigej.pdfIn PDF document text
    • https://mematuseb.weebly.com/uploads/1/3/4/5/134516495/2656694.pdfIn PDF document text
    • https://merusomewazotom.weebly.com/uploads/1/3/4/5/134514041/roxisawelinuw.pdfIn PDF document text
    • https://megogolu.weebly.com/uploads/1/3/4/3/134314378/5307474.pdfIn PDF document text
    • https://zegimobigew.weebly.com/uploads/1/3/4/3/134313375/vetivaro_toxezowi_kirumiwukamile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407789/normal_6056f4ff21253.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5971921-2277-4941-ad8d-5013e6f01c0c/garmin_s60_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cd41602-65f5-43c9-8581-96fe368790fd/abstract_acrylic_painting_ideas_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c29c59e4-e2cd-4469-8f62-7810ce6f49cd/41472745261.pdfIn PDF document text
    • http://banusiv.pbworks.com/f/gta_san_andreas_cheats_xbox_360_fast_cars.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee41ae90-9a43-42ef-a1fd-15afe914d384/rekefumukakisajuk.pdfIn PDF document text
    • http://zigunef.pbworks.com/w/file/fetch/144434613/fiduresujitaposedaze.pdfIn PDF document text
    • http://zikupuzajix.pbworks.com/w/file/fetch/144479010/pawuvubomojatewibar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/181b43ee-ddb9-4034-b855-f162bd6fc38e/sabeduxag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3627e9d4-7f72-4100-891f-8997e5d5c179/lsu_football_workout_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce12c91e-4e1e-4bcc-a5cf-af26146f6b80/present_perfect_and_past_simple_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dba0a50-2239-4ec8-9e21-a30d3842bb46/audacity_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aa703e0-754c-4119-8112-006380912a92/superdry_job_application_answers.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_off0000df66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF66 5604 bytes
SHA-256: dbdadfaade2392aa57b936617258ffc99756a895b53de28ee2c85bf46334d8d8
font_01_sfnt_off0000f286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF286 11096 bytes
SHA-256: aa51b91829a1c3228e5ba31fd10f68c0628bbb38e96a36d6b64af74df1ff2f62

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