Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ffcb42932c82e50…

MALICIOUS

PDF

80.0 KB Created: 2021-02-28 13:37:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 17ad33af763e982d643f3a8a835a48aa SHA-1: 0835f3f99398f7bba25219a63d4e9652a1f1c1a4 SHA-256: 8ffcb42932c82e50b062290279ef4be50d2accd62f9f3515ca8afdfee666f75f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment designed to redirect users to malicious content.

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://crophysi.ru/award?keyword=what+colour+is+quinacridone+magenta PDF link annotation
    • http://phtech.site/borderlands_3_pc_platformwz42x.pdfIn PDF document text
    • https://cdn.sqhk.co/xeliwiwogivo/Ya2hiJE/ocotillo_wells_weather_monthly.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/gusonimusaxowuwavala.pdfIn PDF document text
    • http://clubstore.pro/newonutadunozuborekataop8vx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454541/normal_5fee421611ac8.pdfIn PDF document text
    • http://prizinsta.site/gedukasixovopakolifugigi37rux.pdfIn PDF document text
    • https://cdn.sqhk.co/xadakede/3Ohfsgf/vokurez.pdfIn PDF document text
    • https://cdn.sqhk.co/lutadamafe/gBhdjhv/20596766766.pdfIn PDF document text
    • https://cdn.sqhk.co/wufevinek/tBhgeeB/58958955572.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/sony_str-dn1050_firmware_update.pdfIn PDF document text
    • http://naturagrush.space/honda_generator_dealers_melbourneqdoty.pdfIn PDF document text
    • http://fakurivevid.scienceontheweb.net/emotion_wheel_printable_free.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/gezetega/sazirojo.pdfIn PDF document text
    • http://pufaperimixalet.epizy.com/bodajotupefarebakosewiwo.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/wozugu.pdfIn PDF document text
    • http://vagaloxesawazo.rf.gd/94395483988.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/dunona.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_off0000fc69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC69 5492 bytes
SHA-256: a88d009cebd5257120c8e5a1a79f93ec3368df3045dd5efb5c5079058e707322
font_01_sfnt_off00010eeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEB 10528 bytes
SHA-256: 84ceb06252b585911d1de7c4cbfca574c73f10893e34db3bd9e3cfc9e41e8501

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