Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1d8fa156902b367…

MALICIOUS

PDF

74.2 KB Created: 2021-01-06 02:46:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 6b5aeecdea0f50f9a78e30fb4dfefcb5 SHA-1: 8cb6dc105cf4e496e874ff1dca834b8172295f58 SHA-256: f1d8fa156902b367686dbf58c91cdaf9cd79d2e1e9963a20997abafc746ab537
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users. The primary lure appears to be 'Aptoide free for windows 8', directing users to potentially malicious URLs like https://trafffe.ru/aws.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/aws?utm_term=aptoide+free++for+windows+8 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408992/normal_5fc7a4d31c92a.pdfIn PDF document text
    • https://vosomomoratefuf.weebly.com/uploads/1/3/4/6/134614816/7101294.pdfIn PDF document text
    • https://dufejubodumafeb.weebly.com/uploads/1/3/4/4/134444341/6989273.pdfIn PDF document text
    • https://topizamo.weebly.com/uploads/1/3/4/4/134435864/tematebug.pdfIn PDF document text
    • https://xodetawutal.weebly.com/uploads/1/3/0/7/130774968/01fe15f0ea.pdfIn PDF document text
    • https://vejewumuwuwaja.weebly.com/uploads/1/3/4/7/134759129/mezulenufabaratolex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366949/normal_5f8b2fe867ea0.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/cbffd762-31f1-4cdb-89e6-eca016dafbc6/rezitepegudovisusizasawag.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/41700823436.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91faee7a-b411-4c1f-b97b-6619bbbdad08/poduj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c150ed2e-88d7-4934-acd7-593f17acb48c/list_of_magical_herbs_and_their_uses.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49f25b69-00e1-4b61-9204-1777213d6cc0/video_biography_of_harper_lee.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23948f38-1226-4e65-8868-9944f8f9b29d/kibosuwotonexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef168a6a-70e3-496f-8ffe-079d23223f23/pupaxotapavajekonifanit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1489b623-49c6-44ee-b773-c975e45152ba/cpp_financial_aid_direct_deposit.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/activity_theory_and_individual_and_social_transformation.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_off0000e6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C0 5068 bytes
SHA-256: e633026dac25f124d239f47a509340e612ad94b7fbc4f8ec877dad7c4129f6b2
font_01_sfnt_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 10528 bytes
SHA-256: dc0f86c87138d48e63d25cd95c3be5e03d137e39cecdcc12638a220732e21357

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