Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf596bf2506280fd…

MALICIOUS

PDF

72.5 KB Created: 2021-03-02 02:41:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: cedd2a058e5cc01689dba0727d7bb23d SHA-1: 2761354851080bcdbf76aeef126b661e47813a8b SHA-256: cf596bf2506280fdfe6532140cb73bb57ba3c3e13a08295fddff0a3e2f91510b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by a ClamAV detection and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'autodesk student license', likely intended to trick users into clicking on the embedded URLs.

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://jottigo.ru/strik?utm_term=how+long+is+autodesk+student+license PDF link annotation
    • https://cdn.sqhk.co/dogatefi/highcid/89073500183.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401712/normal_60199ea816435.pdfIn PDF document text
    • http://badge-verification-center.com/nojixelimarawunubuwewu56svj.pdfIn PDF document text
    • https://cdn.sqhk.co/xejadukoxeta/jjuRhj1/laguiole_steak_knives_inox_france.pdfIn PDF document text
    • https://gaxasexafarud.weebly.com/uploads/1/3/4/5/134590452/9105112.pdfIn PDF document text
    • http://nasporte1.fun/nuages_music_sheetjvgog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465690/normal_6021028a322f6.pdfIn PDF document text
    • https://cdn.sqhk.co/libewepigux/hj7VJ9J/92216659302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426270/normal_602ef1e365fcb.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/ihhfZvB/84218525577.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/egejcZt/love_letters_to_the_dead_ekladata.pdfIn PDF document text
    • https://xokefazekuli.weebly.com/uploads/1/3/5/9/135992394/rorizad-vamariraduv.pdfIn PDF document text
    • https://wedarudojov.weebly.com/uploads/1/3/4/0/134012757/66a91c.pdfIn PDF document text
    • https://zofifonanofanap.weebly.com/uploads/1/3/4/8/134876640/xezokexajeviweb.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/nitajosasa/fudasogoniriwevunisokak.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/gevarokejikol.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD049 3936 bytes
SHA-256: d3a16f6e117b2104972e41d94ef73e8fd236dd190ccfc2eb27eb43a52b1bb6dc
font_01_sfnt_off0000de73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE73 5128 bytes
SHA-256: 887796da9843d8ced0f368b84f617d28e27fc8da4ab0a2c6863967b64ecca809
font_02_sfnt_off0000f011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF011 10196 bytes
SHA-256: 39f9b16fbac8f8a4b8135aaafefccb4e15b3bcc4c9622497a0e4a63f7d208ff7

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