Malicious PDF — malware analysis report

Static analysis result for SHA-256 3391e0c55629a10f…

MALICIOUS

PDF

73.7 KB Created: 2021-03-18 22:59:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 38ce1229c82d2fe9147898934071ad9d SHA-1: d3c9c82b6dfbf61af04349e9cb47018ce966ba8c SHA-256: 3391e0c55629a10fc47f528e9af79f6cca956236604c1c6443598b87590fa863
244 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, and contains a large number of embedded links. One critical heuristic identified links to known malicious redirector infrastructure, specifically 'https://yafferge.ru/strik?utm_term=dixie+chopper+tires+24x11x10'. The document body is heavily obfuscated and appears to be a lure, likely related to search engine optimization or phishing, given the extensive link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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=dixie+chopper+tires+24x11x10 In PDF document text
    • http://moradudipomibo.mypressonline.com/moving_average_tutorial.pdfIn PDF document text
    • http://wegansit.space/healthy_eating_meal_planner_templateq1ckq.pdfIn PDF document text
    • https://xovomono.weebly.com/uploads/1/3/5/3/135345708/mekofikilivovezotemo.pdfIn PDF document text
    • https://vuminuzatadabem.weebly.com/uploads/1/3/4/3/134311796/1273947.pdfIn PDF document text
    • http://pewujok.mypressonline.com/82532757761.pdfIn PDF document text
    • http://komarovskii.xyz/9332691120409eih.pdfIn PDF document text
    • https://debugifepini.weebly.com/uploads/1/3/1/0/131070476/7040176.pdfIn PDF document text
    • https://wiselulusitafe.weebly.com/uploads/1/3/4/8/134892864/2782881.pdfIn PDF document text
    • http://ranupila.mywebcommunity.org/cp_plus_cctv_price_list.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/0c0e6cfd-0103-4791-8162-a381d3fda889/how_much_does_business_development_manager_make.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/fuvisazuravewupir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c96ce7e-398a-420c-a9ec-a8dcee7c66d8/pak_army_officers_protocol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f765600-ee79-41ed-b92f-b5d9a79e72d1/50919219279.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17aeffd8-f14a-4c2e-b9dd-283d262bec31/catia_v5_tutorial_book.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/how_to_get_keys_for_last_wish_raid.pdfIn PDF document text
    • https://s3.amazonaws.com/dapekufoxiraku/latanoprost_davis_drug_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32b9821c-b9ba-42e0-ae88-c80a5cc37a01/zovubaz.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/pogegenuwezofagipu.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/baahubali_2_movie_songs_naa_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/juz_30_download_muzammil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c664e1bd-0e9d-4859-bbe8-cc63b4e6fac2/lesekawobukuvojibitudorin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abc4e244-bae5-44cd-9945-635d077110ed/2013_honda_accord_v6_maintenance_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec438b88-dfdc-4356-871d-c8555b991385/kibadujekuvobifaxo.pdfIn PDF document text
    • http://xomutojekes.myartsonline.com/when_do_you_wear_your_military_uniform.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_off0000e23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 5260 bytes
SHA-256: dbde34f34ffac8ca263c973fbeaf8312b4f94783f3a54ee587122be0b9e06fce
font_01_sfnt_off0000f439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 10888 bytes
SHA-256: b6edf4c4fba7809e4a1d481bd289bc5b9a9c08815f53e028861e31d0d14d8649