Malicious PDF — malware analysis report

Static analysis result for SHA-256 245c54341adc5f8d…

MALICIOUS

PDF

93.5 KB Created: 2021-04-17 12:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: ff7839a634b68c4097dcfd87d9e063dc SHA-1: e90b75bdfae53276db2e04d56a8b2a7f6a9c7bc1 SHA-256: 245c54341adc5f8db47460d1f3dfacebb2059933359bfb37dc757fdfaf6f7c3f
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains numerous links to external PDF documents, a common tactic for building link farms or distributing malicious content. One critical heuristic firing indicates a link to known malicious redirector infrastructure, specifically 'https://yafferge.ru/strik?utm_term=canon+a-1+vs+ae-1'. The ML classifier and ClamAV detection further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=canon+a-1+vs+ae-1 In PDF document text
    • http://wowevopopof.22web.org/kigug.pdfIn PDF document text
    • http://gazorowegesejix.22web.org/58724087607.pdfIn PDF document text
    • https://dalemugoxopil.weebly.com/uploads/1/3/4/5/134587536/luzabuvodi.pdfIn PDF document text
    • https://panasijizikefiz.weebly.com/uploads/1/3/4/4/134446590/3806172564c922e.pdfIn PDF document text
    • https://vutitikanok.weebly.com/uploads/1/3/4/7/134774074/9803577.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_72349799cef4443db7561849c0c0fbd2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0ab78a0-095c-4f43-ad77-568c3c38c993/fegowitixotovabep.pdfIn PDF document text
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_dec85db83e4646edb9a29994b97b3164.pdf?index=trueIn PDF document text
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_7b62d118c20249498161545f253c3ca3.pdf?index=trueIn PDF document text
    • http://datufubizut.rf.gd/sawunonol.pdfIn PDF document text
    • http://juvugakor.rf.gd/nuvapatotizeraw.pdfIn PDF document text
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_d273c658ebe046e08019c24306915b85.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba5fb324-58e8-439c-970e-12b9e998f64d/how_to_calculate_calories_in_juiced_fruit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa4b5375-7b77-49c5-a0c8-067c963905e6/sojojabedonuzegawazop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9850b240-5832-4174-b338-df65600a0381/altec_bucket_trucks_for_sale.pdfIn PDF document text
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_737a29fab6ea4cdf952abaf318278c6d.pdf?index=trueIn PDF document text
    • http://lugirike.epizy.com/guatemala_safety_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef66652-dd48-498a-8a86-d476346131d4/popivefebeko.pdfIn PDF document text
    • http://legopabez.rf.gd/51521968575.pdfIn PDF document text
    • http://nozixexegaliwe.rf.gd/elementary_statistics_a_step_by_step_approach_7th_edition_solution_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d2024ef-8ce4-4204-bb86-8015b3b6fcbb/mastery_robert_greene_audiobook_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00261e98-ca8b-4c4b-af3c-6645d237b479/cual_es_la_estructura_de_un_texto_historico.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_off000130b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B0 4600 bytes
SHA-256: 949900c96e0137a9faa81c894fb8a77c2634c90d9c8629409e48c63d518d01a0
font_01_sfnt_off00014077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14077 11676 bytes
SHA-256: e365df27538ec59b273c56ae5627129d227b156ed8e8c54a7439193d6e00e309