Malicious PDF — malware analysis report

Static analysis result for SHA-256 823a162c5fc5ed00…

MALICIOUS

PDF

85.7 KB Created: 2021-03-31 18:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: babd3d326b0d0a62d977e872821eef90 SHA-1: 22dd217454640c8a6a77f00f375785a5451a03f1 SHA-256: 823a162c5fc5ed00263b736dabe78eb289495ce5969dda5f0b3bc04e554871db
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it is a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of external URIs and the overall structure point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=bad+blood+book+made+into+movie PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4529024/normal_6006d4b6e0bf0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496381/normal_605d7074f146c.pdfIn PDF document text
    • http://lnstagrambusiness.com/carrocerias_ganadeiras_molas1ruwl.pdfIn PDF document text
    • http://adminhalil.com/wwe_champion_wrestling1bdhb.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/fiahije/bigfoot_app_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450154/normal_5fd6576b5cf73.pdfIn PDF document text
    • http://wersita.space/zaribalikirotudexisoduwudnt.pdfIn PDF document text
    • https://cdn.sqhk.co/dovutiwabule/3hgOfhf/12000185785.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzipogowita/jiisbUC/6510407056.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480581/normal_5ffdb0c3b322b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414515/normal_605b54995f641.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/bc0f3ceb-b95d-4cea-ba8e-a7986831c1ab/vadajufeja.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/clash_of_clans_hack_apk_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/wovigojo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7ce6114-7a34-4ea5-9f58-cd961ae9109f/marbury_v._madison_apush_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/64538980066.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/598590ad-68f4-477a-93af-5654235f8bfb/wamebogigeluluvokudozu.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/sofidodurejubef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9b8d9d1-6479-4bd5-b21f-9793dad85a81/what_is_the_mystic_law_of_the_lotus_sutra.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbc8a22a-31b9-4e96-85eb-f65081542d3a/15463467183.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuzo/knights_chronicle_team_building_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df50204-2f6e-4480-8bf4-b2d933772f3f/71743842506.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_off00011447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11447 5008 bytes
SHA-256: d36567334556cfe014c612b43cc92c8f80f8fa8ead6f86414dfaaee21997d475
font_01_sfnt_off00012549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12549 10656 bytes
SHA-256: 5a283ca2891402ff26e7d228a2f2f18028acd69632f18f1e5b2d7899cea5e92d

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