Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b1826dca01fe0fb…

MALICIOUS

PDF

91.5 KB Created: 2021-03-08 04:19:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 080cdd6b13ad6b37c2dec5c55f4e7a66 SHA-1: 51ebeed8a2e7365bf8e9abcd4e6eec943522d9b6 SHA-256: 7b1826dca01fe0fb458798eeae0fa5ed2c378c97701dfbd7c8a9d3c8f2ca4e0d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. The presence of multiple disposable hosting domains and UTM parameters suggests an attempt to manipulate search engine rankings or redirect users to potentially malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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://vilenefex.ru/aws?utm_term=how+to+program+hunter+douglas+motorized+blinds PDF link annotation
    • http://tehnopolis.org/sony_mdr_v6_vs_mdr_75066vkki.pdfIn PDF document text
    • https://wasaxedunup.weebly.com/uploads/1/3/1/4/131453111/labapijolejeles_xazabe.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/brihDqN/every_time_you_need_me_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/gapekozuwa/hfgkhjj/junonowifod.pdfIn PDF document text
    • http://batmbatm.ru/86983144084i4fse.pdfIn PDF document text
    • https://cdn.sqhk.co/venitalobeni/qghiYBa/weird_interesting_facts_about_math.pdfIn PDF document text
    • http://vk-settings-change.online/remove_ice_maker_kenmore_refrigeratore4qok.pdfIn PDF document text
    • https://wajirabipuxu.weebly.com/uploads/1/3/0/8/130874591/b382c5d3346.pdfIn PDF document text
    • https://zekorawuj.weebly.com/uploads/1/3/4/8/134862422/lifawudo_selogubivufofeg_pimigulemip_nuxutigolupulo.pdfIn PDF document text
    • https://biziliwedurukax.weebly.com/uploads/1/3/4/8/134889104/difulerosaw-zilaki-wazobevan-vowiwetaxobo.pdfIn PDF document text
    • https://cdn.sqhk.co/pevejotomoma/fMQgiou/world_of_tanks_blitz_hack_apk_2019.pdfIn PDF document text
    • http://xumegexujarev.22web.org/conference_schedule_template.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabalero/gjogcij/extreme_car_driving_simulator_2_mod_unlimited_money.pdfIn PDF document text
    • https://bukekumagisalej.weebly.com/uploads/1/3/5/3/135333054/75808af0bd0bba3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/daxemo/jakudugevi.pdfIn PDF document text
    • http://zetamox.epizy.com/charles_dickens_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc3b66db-a47e-45be-ac79-9cbd9e717fe8/jejuz.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/20681867984.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be2a1f55-a42d-4fa3-b14e-ca4a64ab3c60/pibivavig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8162444-85f6-4cc5-bbf9-7d8b23e06d42/cravity_jumper_lyrics_translation.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_off000118fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FE 5496 bytes
SHA-256: 0183e681b387110e360307c23161b948a145bbe8659da8b7a2ecdd7e655d2e57
font_01_sfnt_off00012b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8E 11384 bytes
SHA-256: 02096b6ca253995e6a830ff8f569f0aa8def277829ea329d90bbdadd3a91184c
font_02_sfnt_off00015213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15213 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c