Malicious PDF — malware analysis report

Static analysis result for SHA-256 3173fc1dafbc5465…

MALICIOUS

PDF

86.1 KB Created: 2021-03-04 14:42:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 051299b09e48b860298b6f30af58a527 SHA-1: db505e351a528f0c6ed0a2fc4b19161a7db9bc08 SHA-256: 3173fc1dafbc5465401b43d9bb7fb0b92f3210248b83ac9cf158a3649101d5a6
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary external URL points to a keyword-related manual, indicating a lure to attract users searching for specific technical information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/wix?keyword=30+amp+manual+transfer+switch+kit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450160/normal_6036c0ce133fb.pdfIn PDF document text
    • https://pafetinavip.weebly.com/uploads/1/3/4/8/134868030/pajuvesimiv.pdfIn PDF document text
    • http://pristav.pro/axial_scx10_iii_jeep_jlu_wrangler_rtr4c2f5.pdfIn PDF document text
    • http://twitter-center.com/metformin_dose_in_renal_failurewey6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419204/normal_60321cc54b1e7.pdfIn PDF document text
    • http://mattelipsticks.site/consumer_reports_mattresses_sleep_numbermzjb6.pdfIn PDF document text
    • https://bexusisase.weebly.com/uploads/1/3/4/5/134596812/9551448.pdfIn PDF document text
    • https://xikalevu.weebly.com/uploads/1/3/4/3/134319979/9683560.pdfIn PDF document text
    • http://forsage.pw/vuzojoju6lpni.pdfIn PDF document text
    • http://magic-world.site/windows_98_download_free_full_versio8saea.pdfIn PDF document text
    • http://katermore.ru/67075640344edf2.pdfIn PDF document text
    • http:///\\\/twitter.com\\\/GeneratorsDirec\,\icon\:\icon-twitter\,\title\:\Twitter\},\Pinterest\:{\href\:\http:///\\\/pinterest.com\\\/generatorsdirec\\\/\,\icon\:\icon-pinterest\,\title\:\Pinterest\},\YouTube\In PDF document text
    • http:///\/www.bbb.org\/chicago\/business-reviews\/industrial-equipment-and-supplies\/power-equipment-direct-in-bolingbrook-il-57001088,title:ElectricIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_26d6a9f8fdf44ad99552d48aa0064f8e.pdf?index=trueIn PDF document text
    • https://de99934f-f465-4d69-af5e-14f317c0a7c6.filesusr.com/ugd/4fea5c_d56c98c8fa744a4dbbfa3602a0cc96c3.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_7dab256e32324617b9f4384858b90a64.pdf?index=trueIn PDF document text
    • https://dd2aaa18-cea4-4e9b-af21-3079f302b7ce.filesusr.com/ugd/4fb05f_22f70e718c8248d286f1b92210ce08d6.pdf?index=trueIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_0589f3e7fdbc49758fca2c8e806a02e3.pdf?index=trueIn PDF document text
    • http://lojetewope.epizy.com/ledujakoxulo.pdfIn PDF document text
    • http://besogigususatu.epizy.com/how_much_would_a_first_edition_harry_potter_book_sell_for.pdfIn PDF document text
    • http://laxowukuwex.epizy.com/river_flows_in_you_piano_sheet_music_free_download.pdfIn PDF document text
    • http://xefokezutuvij.epizy.com/11729761837.pdfIn PDF document text
    • http://zufejudo.epizy.com/wibalebunikuguzogagatema.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_off0001061a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061A 5624 bytes
SHA-256: 30bac76aa75b47b453ccf06916c97ba12d0c1aed74f5d2bc10f60d1d516243aa
font_01_sfnt_off00011922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11922 15780 bytes
SHA-256: ff70d50e9ecdd138c4fbfb8720a8f3a97eddb7003b403e62ca340f6211a4a2c5