Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef36b1950886374…

MALICIOUS

PDF

80.1 KB Created: 2021-03-06 06:34:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8201bada2c67afa6c3b04a957edb412d SHA-1: a00945304fb3a827d992e3cb29a7c66cc212bace SHA-256: 0ef36b19508863741e4ac6a94502322ed7908f89b6c15393a4c0556ef3b3353b
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links pointing to various domains, many of which appear to be disposable or used for SEO spam. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The primary function observed is acting as a link farm, potentially to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/strik?utm_term=overthrow+stephen+kinzer+book+review PDF link annotation
    • http://ridaxaki.mywebcommunity.org/24701925717.pdfIn PDF document text
    • https://xavodumofas.weebly.com/uploads/1/3/4/9/134901052/c27fd3b796c2183.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/XP4UOhf/sologujezo.pdfIn PDF document text
    • http://xemokajoled.medianewsonline.com/how_to_reset_a_holmes_humidifier.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/fZDHgjI/lovecraft_country_season_2_tic.pdfIn PDF document text
    • https://fumunavizagoz.weebly.com/uploads/1/3/4/2/134235019/2912744.pdfIn PDF document text
    • https://morisoxurekes.weebly.com/uploads/1/3/4/4/134464458/vutomuwonipemajim.pdfIn PDF document text
    • https://fepobiwebefu.weebly.com/uploads/1/3/4/5/134592484/riwuposo_makolareviwuza.pdfIn PDF document text
    • https://jumekurokenawuw.weebly.com/uploads/1/3/0/7/130739991/kirosotaru.pdfIn PDF document text
    • https://garotilalu.weebly.com/uploads/1/3/0/7/130739336/gumezufovolix.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiminiv/ahfPPgc/hungry_shark_evolution_game_guardian.pdfIn PDF document text
    • https://lokejarezuwomi.weebly.com/uploads/1/3/0/7/130776656/55664b5c87ac.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunagakiz/hgchegh/xatuwaxusupedub.pdfIn PDF document text
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/bexagununexuzazeg.pdfIn PDF document text
    • https://cdn.sqhk.co/gufemazibafi/Ehegeha/mumewajitapapila.pdfIn PDF document text
    • http://tejovotemikodes.getenjoyment.net/5683186953.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/xonaxevetaf/gosozizurerajogaxosumin.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/dnd_homebrew_campaign_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/indian_hypertension_guidelines_2018.pdfIn PDF document text
    • http://likutolejit.onlinewebshop.net/how_to_gain_unstoppable_confidence.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_off0000fbd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD6 5096 bytes
SHA-256: 203ef514369899300eff7bad94c12d6fcd576aeb9ee8ff4d025a75d9a94f05a9
font_01_sfnt_off00010d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D44 10928 bytes
SHA-256: 31354c511a8dd559f72d269192dc28c9db940723edd27adb0d519144b4310fc2

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