Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1bae3572d68a91a…

MALICIOUS

PDF

74.7 KB Created: 2021-03-25 02:02:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6a1a15fa982a4ce8091eca4abbb7d88b SHA-1: cca8d24fe496b504d0046b9af78054bfce6204e1 SHA-256: b1bae3572d68a91aa71c16eed0a1b0045c0f51d37d4ab72985dfd41abc9e6429
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, specifically flagged as Pdf.Phishing.Trojan. The PDF contains numerous embedded URLs, with one prominent example being 'https://xezojetit.ru/strik?utm_term=kenmore+500+series+washer+timer'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, suggesting a phishing or spamming campaign. No scripts were extracted, but the structure and URL distribution strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/strik?utm_term=kenmore+500+series+washer+timer
    • http://zunuruxeguxifi.mygamesonline.org/86692219172.pdf
    • https://cdn-cms.f-static.net/uploads/4407552/normal_6050f2345c78c.pdf
    • https://cdn.sqhk.co/mixubiki/b3bxVhd/kazuve.pdf
    • http://kesimaseduwedob.22web.org/beehive_class_9_chapter_4.pdf
    • https://cdn-cms.f-static.net/uploads/4413012/normal_60399cf95da92.pdf
    • https://nomikevokatipo.weebly.com/uploads/1/3/1/8/131859895/4057829.pdf
    • https://cdn.sqhk.co/gibewuzavi/gjhawhd/11640885274.pdf
    • https://cdn.sqhk.co/xakalodesi/idfrha4/panda_glass_bubbler.pdf
    • https://cdn-cms.f-static.net/uploads/4473954/normal_602d441d34a1c.pdf
    • https://tuzopukerokep.weebly.com/uploads/1/3/5/3/135347688/2749417b4.pdf
    • https://dujizajep.weebly.com/uploads/1/3/4/7/134704211/zujor.pdf
    • http://nivawegokex.22web.org/asus_precision_touchpad_driver_windows_10.pdf
    • http://fukerijinexin.mygamesonline.org/87924666056.pdf
    • https://dotanivim.weebly.com/uploads/1/3/4/7/134705276/7327623.pdf
    • https://cdn.sqhk.co/fatobaliv/Ecghf4t/as_catacumbas_de_roma_em.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tufuripisaren.epizy.com/where_is_the_wps_button_on_my_comtrend_router.pdf
    • http://lifobem.myartsonline.com/72797235263.pdf
    • http://xesivaraxetude.rf.gd/what_causes_you_to_get_pimples_on_your_head.pdf
    • https://uploads.strikinglycdn.com/files/ee511603-0898-45b1-8959-300346396343/4544970389.pdf
    • https://uploads.strikinglycdn.com/files/1f8f3146-f6fc-42bc-9edd-62709395294f/dukupufozaje.pdf
    • http://jazopizebe.atwebpages.com/attainment_test.pdf
    • http://rixuroruwe.myartsonline.com/calculus_2_formulas.pdf
    • http://xigibisas.rf.gd/42984011323.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4bc.bin
5190f0f1622caacf0169f7f103173188b72dee541efce1a2ee0c82ead32ece69		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BC 5220 bytes
font_01_sfnt_off0000f668.bin
596c78b50e114ec02b1f01062728f319aa52f7abf6b8a602efce5d0284b5a670		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 10844 bytes

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