Malicious PDF — malware analysis report

Static analysis result for SHA-256 091db5c99a80be05…

MALICIOUS

PDF

79.9 KB Created: 2021-04-13 09:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0bd19fa708b25916f8e341b4f3ad32e SHA-1: 513fe1fde3d4aef0d95e5ca35551648392af4fd5 SHA-256: 091db5c99a80be059ef483e0912964932ddd89b9896e94a530ccdbc7d7670dc3
166 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm and an advance-fee scam lure, directing users to external URLs. The presence of embedded URLs and the nature of the heuristics strongly suggest a phishing or scam attempt.

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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://maypoin.ru/strik?utm_term=what+foods+go+well+with+rioja
    • https://cdn-cms.f-static.net/uploads/4445119/normal_603873e138f4b.pdf
    • http://xanevejesofag.mygamesonline.org/bonding_in_boranes.pdf
    • https://cdn.sqhk.co/reparepoki/mXifgjg/46971054243.pdf
    • https://cdn.sqhk.co/jivonaxadu/gfajct6/trending_instagram_hashtags_today_2020.pdf
    • http://runojiwum.getenjoyment.net/zumirubujobuvikipi.pdf
    • http://bakofutemuxasog.iblogger.org/aocs_official_method_cd_8b_90.pdf
    • https://cdn-cms.f-static.net/uploads/4414498/normal_6056dce4f289d.pdf
    • https://cdn.sqhk.co/naxetimi/ohBicje/tiwuvufuforavipulo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d2d110b1-dce0-4b0c-bed7-be24280b7a6e.filesusr.com/ugd/165585_13889353161f4887abbb754bdbcf0c93.pdf?index=true
    • https://3c45aaf8-24f3-4cde-9773-cf44a0a970d3.filesusr.com/ugd/ae7d54_a023914bd13b41369377fd8aec848ea3.pdf?index=true
    • https://s3.amazonaws.com/fadadedezeker/pivodo.pdf
    • http://butadiviwev.rf.gd/wudugumibekizeribudo.pdf
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_d2ca180cd8fa4be8a226557e645a7263.pdf?index=true
    • http://podapuleleg.epizy.com/chomsky_normal_form_exercises.pdf
    • http://nodufezazu.epizy.com/grahan_kadambari_download.pdf
    • https://s3.amazonaws.com/tunenijexe/pigujisevavarujaxigafebo.pdf
    • http://wiloradakuno.onlinewebshop.net/ibps_clerk_results.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5fc.bin
df20679585e443b562271f59c218f35214d277d8637b68b0b6760931e124be30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FC 5352 bytes
font_01_sfnt_off00010846.bin
19ecf07a2af34935e606e712b8b8b775c7dfaaff018915c75cb680a4dda8f12c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10846 12380 bytes

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