Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e66b4cfdee0f87a…

MALICIOUS

PDF

81.8 KB Created: 2021-04-09 02:17:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: d0a4befe75664f5fb9c5b5cdab99fb0b SHA-1: 5baf0d779f1ebebc526d97b0ef8ad6cc2a66bf92 SHA-256: 6e66b4cfdee0f87abaf2efb2e477c3ecfd46c6b818d2fa290ece6734206e8f78
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://ponafet.ru/strik?utm_term=why+isn%2527t+my+new+hot+water+heater+working PDF link annotation
    • https://pufenenuboz.weebly.com/uploads/1/3/0/7/130738511/rojibipuba-gogewubaruj-xijafa.pdfIn PDF document text
    • http://parralax.net/dont_apples_to_oranges_meaningqbz3v.pdfIn PDF document text
    • https://japutiluzot.weebly.com/uploads/1/3/5/9/135991977/juner.pdfIn PDF document text
    • http://b4shop.icu/6381656132533y33.pdfIn PDF document text
    • https://wavopotajulaja.weebly.com/uploads/1/3/4/6/134631105/girebubak-nufas.pdfIn PDF document text
    • http://dapabikokewe.iblogger.org/ariel_sylvia_plath_book.pdfIn PDF document text
    • https://povefedonigo.weebly.com/uploads/1/3/1/6/131637150/xizesavovuporat_lowog.pdfIn PDF document text
    • https://kusikulovaledif.weebly.com/uploads/1/3/1/6/131606813/wubizonakawexom.pdfIn PDF document text
    • https://dolunejasuvufa.weebly.com/uploads/1/3/0/7/130776008/mivuxudipugufa-zotodibegom-soladoge-nikajekirudoxob.pdfIn PDF document text
    • http://sis-paypal.com/are_old_guitar_world_magazines_worth_anythingxar7r.pdfIn PDF document text
    • https://wudujadulaneg.weebly.com/uploads/1/3/0/7/130738887/9139582.pdfIn PDF document text
    • http://vashobereg.com/general_medical_council_guidelines_consentw8eqg.pdfIn PDF document text
    • http://marketeuro.pro/scott_pilgrim_art_styleac1mt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a40b6db0-1679-4e03-879f-ac5827b9aa7d.filesusr.com/ugd/dba42a_be1a7b4ba5e247388319db28b02e1c3c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rujabepifar/81178003731.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_e3ec51ee2bdc4e11894cfd9bbf1c7f22.pdf?index=trueIn PDF document text
    • http://xibezesod.epizy.com/ruzaxafumevawowonu.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/38889049147.pdfIn PDF document text
    • https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_1d42fbff333c4a6faf1502f0acde3862.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/what_is_the_holy_spirit_of_god.pdfIn PDF document text
    • http://juwebud.epizy.com/jipurux.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_off000102de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 5372 bytes
SHA-256: 806da76a58c90e6c18ee38e89ea1d039e0d663183e38830be36d2439f089b9ca
font_01_sfnt_off0001151e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1151E 10684 bytes
SHA-256: aedeef079b495b2f7592d67f9a97b6e64f769e6880cf5db0e3110aa9f528335e

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