Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d05a3a6a754b32…

MALICIOUS

PDF

77.3 KB Created: 2021-04-29 10:15:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f3a9389de885b42d5d453b9e33efb351 SHA-1: e672e6db5aaff6de817384558357cd87f9fb779e SHA-256: f8d05a3a6a754b32142ee0f86a2f896f3778bddec863688d5c124211626c682f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The primary URL, 'https://mezovuduw.ru/strik?utm_term=how+to+clean+mold+out+of+a+front+load+washing+machine', is presented as a guide but likely leads to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://mezovuduw.ru/strik?utm_term=how+to+clean+mold+out+of+a+front+load+washing+machine PDF link annotation
    • http://jekefidaz.mygamesonline.org/lajawageteruvedemojabifeb.pdfIn PDF document text
    • http://pofuxubilet.sportsontheweb.net/zezurelifefigujufikeki.pdfIn PDF document text
    • http://sogixusi.medianewsonline.com/lg_top_load_washer_ratings.pdfIn PDF document text
    • http://fudoviwil.mywebcommunity.org/proper_care_and_feeding_of_marriage_summary.pdfIn PDF document text
    • http://peguxukeziku.sportsontheweb.net/adolescent_health_care_a_practical_guide.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/ford_mustang_mach_1_1969_price_in_pakistan.pdfIn PDF document text
    • http://tedurelaseji.mygamesonline.org/manejo_de_bosques_tropicales.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bb40d88-c55e-4ce6-a252-b431e5f5dba8/24669876273.pdfIn PDF document text
    • http://rexefobixavater.myartsonline.com/pdfcandy_to_ppt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a33540d-9932-43ba-a11f-18e7591b58b6/ikea_kitchen_catalog_2019.pdfIn PDF document text
    • https://b133b025-67d1-4190-9e53-fbb99503dec2.filesusr.com/ugd/caf13f_04517ebc8d1248f797a11f9a5969ba02.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d4aa2e-4ced-4b9e-b03d-9feb763d3e30/is_sonic_soft_serve_real_ice_cream_made_from_pig_fat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c950e0a1-3444-4382-b824-c84a0c0fff45/john_fante_ask_the_dust_free.pdfIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_ab72288911a54556a3116522258970d4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3ebe3b0-c05f-4218-b118-5e17c820be9f/mary_poppins_supercalifragilisticexpialidocious_lyrics.pdfIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_d7e7d22b26de4495aa538113b1310959.pdf?index=trueIn PDF document text
    • http://saxodanokijaj.atwebpages.com/gadixa.pdfIn PDF document text
    • http://suzifoki.myartsonline.com/pinafodono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93ea34ca-7cde-4c89-9f54-c22bcc62c5d9/siruzuramamozupurixa.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_off0000ed5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5E 5488 bytes
SHA-256: 20210f7d9baea49496aca320eb534b276681e0a5504021677ca33768c92c0e91
font_01_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 11672 bytes
SHA-256: 981404db0aa139c168f58ee5e8fdadf086f8db0541e05314c881e6c830c8a00c