Malicious PDF — malware analysis report

Static analysis result for SHA-256 2071f97eb8cd6e2b…

MALICIOUS

PDF

79.3 KB Created: 2021-03-25 12:08:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e1628e3990c33ac21f6edbc1acbf43a2 SHA-1: c92d261eafd9267e08d321481ea261410862c2d0 SHA-256: 2071f97eb8cd6e2bca003fcf25d2b65160c8bcbf6948542c5739cf038c6fb5aa
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous external URIs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://lozipotod.ru/strik?utm_term=navien+npe+240a+recirculation+pump+install PDF link annotation
    • http://dawexefif.getenjoyment.net/veluvanaxodevusejakavi.pdfIn PDF document text
    • http://rivepozepuxar.mywebcommunity.org/neferow.pdfIn PDF document text
    • http://damvglaz2.xyz/jovuro7io0m.pdfIn PDF document text
    • http://lipazegeboludep.sportsontheweb.net/ascochyta_rabiei.pdfIn PDF document text
    • http://motivawka.online/29563628484qear9.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/pipiwetukilunavesemuwiv.pdfIn PDF document text
    • http://korefubelexusiz.medianewsonline.com/cub_cadet_lt1050_repair_manual.pdfIn PDF document text
    • http://cetly.xyz/automation_anywhere_clientvtys7.pdfIn PDF document text
    • http://riwuvodobopexu.mywebcommunity.org/funza_lushaka_application_form_2020_download.pdfIn PDF document text
    • http://waliduv.mypressonline.com/mapa_asia_politico.pdfIn PDF document text
    • http://sitonuba.mypressonline.com/44287413506.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://590703a0-be71-4d3c-a49f-17767d5969ef.filesusr.com/ugd/656c20_8e63c82b5090479883beeb788431ed50.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/37f36d80-5c86-464b-8dfb-5b41f6e052ca/99457456885.pdfIn PDF document text
    • https://s3.amazonaws.com/neviwove/75194566106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7984a194-79b1-4d9c-9430-232af08199ee/how_much_does_it_cost_to_rent_a_skid_steer_from_home_depot.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/what_is_the_salary_of_a_certified_internal_auditor.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_0b00d81ec5624b98be2618b3637dd36a.pdf?index=trueIn PDF document text
    • https://5b3fc17b-a4fb-4144-9a53-ff617e35bc6a.filesusr.com/ugd/696117_a9c5351a8fae4edcb8f53008a161950e.pdf?index=trueIn 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_off0000f82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82A 5468 bytes
SHA-256: 6f0165cde149112594d79965429e5dda40ab7ae92ff5845def03c410be50c098
font_01_sfnt_off00010ac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC3 10796 bytes
SHA-256: 8eacc1d9de5c39d37d2e18cd210aabc5b168ef28c3f620126a549bea038ac0bf

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