Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ed797b1fb10e25…

MALICIOUS

PDF

83.9 KB Created: 2021-06-06 23:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8e3cdceb2e6102f76497447e8d853f5 SHA-1: 041d56ef3a57cce14fc674fe4e7aff4853470eec SHA-256: 86ed797b1fb10e2525b279c8af70adf2455f310826f2cd6134c997205778e726
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, many pointing to disposable hosting services, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO manipulation. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://chcial.ru/pbw?utm_term=what+thread+should+i+use+for+friendship+bracelets
    • https://xifemobagot.weebly.com/uploads/1/3/4/0/134000541/bovonurozonoronu.pdf
    • https://lebamemodeli.weebly.com/uploads/1/3/0/7/130776101/zadizup.pdf
    • https://fexolemigelewi.weebly.com/uploads/1/3/4/2/134235379/sanaraxisojigax-givemo-sivivi-suzoponig.pdf
    • https://cdn-cms.f-static.net/uploads/4502178/normal_6030914a69332.pdf
    • https://litazivufili.weebly.com/uploads/1/3/4/3/134305244/gutasupamituzugonisa.pdf
    • https://segoponozumi.weebly.com/uploads/1/3/4/0/134000249/7540114.pdf
    • https://kisejugizojo.weebly.com/uploads/1/3/4/6/134656745/puzogamajiwuviganezu.pdf
    • https://static.s123-cdn-static.com/uploads/4426547/normal_5ff21e774c48d.pdf
    • https://wugarusuxota.weebly.com/uploads/1/3/0/8/130814120/jizupafufire.pdf
    • https://xuzipitazejaj.weebly.com/uploads/1/3/4/7/134722028/aa5a0.pdf
    • https://rilopogikumifo.weebly.com/uploads/1/3/4/3/134320310/5072346.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zajozote.pbworks.com/w/file/fetch/144475548/romirixafumudolotuxun.pdf
    • http://ronuzexem.pbworks.com/f/poxadibewujuj.pdf
    • http://tavaretaz.pbworks.com/w/file/fetch/144747780/dumpper_and_jumpstart_apk_download.pdf
    • http://liwuvedesisu.pbworks.com/f/nuance_power_advanced_3_full_download.pdf
    • http://nusometa.pbworks.com/w/file/fetch/144695916/sazikajunekika.pdf
    • http://nerobedevu.pbworks.com/w/file/fetch/144447234/price_of_toyota_revo_2018_in_pakistan.pdf
    • http://nipekari.pbworks.com/f/amaravati_kathalu_satyam_sankaramanchi_free_download.pdf
    • http://sijomirurefi.pbworks.com/w/file/fetch/144443244/euro_truck_simulator_2_bd_bus_mod_android.pdf
    • http://bepisoxu.pbworks.com/w/file/fetch/144437187/13576861852.pdf
    • http://xixokuzujoz.pbworks.com/w/file/fetch/144427209/fuxifajejikog.pdf
    • http://subazim.pbworks.com/w/file/fetch/144683679/10510085837.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f27c.bin
f72fc1265db23438b82b0619ec8f6d889a0023109b54a65f05067c43cc11ddfb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF27C 5396 bytes
font_01_sfnt_off000104da.bin
8b73c7c70786b69b52b5917b8821842c7c243ad1c2180925d44bc1b4710f3bcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 11452 bytes
font_02_sfnt_off00012c54.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C54 16204 bytes

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