Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ae008e61fb19f2…

MALICIOUS

PDF

80.9 KB Created: 2021-03-01 01:13:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0b4b32e1d4c21c8a903ac31d1238656b SHA-1: eafca1d426df08a10304adc81592836ddb58723e SHA-256: c7ae008e61fb19f2653f8eb284ec4bf120ec7fa7e5db240d8f8754c6781609fc
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, and one prominent URL related to downloading printer drivers. This suggests a phishing or malware distribution lure, likely using a link farm to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/wb?keyword=descargar%20drivers%20impresora%20samsung%20clp-325 PDF link annotation
    • http://7gusevshop.website/34014150887v4ct7.pdfIn PDF document text
    • https://cdn.sqhk.co/ditetijesi/xghhhja/tags_for_videos_on_facebook.pdfIn PDF document text
    • https://derikuboxema.weebly.com/uploads/1/3/0/7/130776504/8374591.pdfIn PDF document text
    • https://bedaxeribijone.weebly.com/uploads/1/3/2/8/132814155/cf4765728ce8d4.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/duwiwumo.pdfIn PDF document text
    • http://istra-backwater.ru/vivisibovusajruqzh.pdfIn PDF document text
    • https://cdn.sqhk.co/nugizape/bUP0Bpr/transmission_fluid_repair_cost_mazda_6.pdfIn PDF document text
    • https://poturifipejo.weebly.com/uploads/1/3/4/7/134767967/wajewikuwudapi.pdfIn PDF document text
    • http://trenketo.buzz/83438994039jy7iw.pdfIn PDF document text
    • http://organic-ita.space/67222084810freno.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/the_last_wish_witcher_book_hardcover.pdfIn PDF document text
    • http://goproonly.com/79509617583yp2ha.pdfIn PDF document text
    • https://zadopelujon.weebly.com/uploads/1/3/4/8/134884154/rigudaxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/clever_answers_to_what_s_up.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/24051877635.pdfIn PDF document text
    • http://kubomefewofumim.atwebpages.com/orpheus_and_eurydice_myth_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/limewub/user_manual_for_whirlpool_oven.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/internship_report_on_apparel_merchandising.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/23281487692.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_off0000fafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFE 5904 bytes
SHA-256: a04ca122edba8962812cd6e4b99a576e06a9a171c0d8b6530fd03edd85ab5d87
font_01_sfnt_off00010f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1A 11344 bytes
SHA-256: 896679f0c217ea9b8d351378d00f9fdf3ff32630461c7b89c222176c04640072

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