Malicious PDF — malware analysis report

Static analysis result for SHA-256 4351053d527dca19…

MALICIOUS

PDF

69.4 KB Created: 2021-03-14 19:48:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 88b71e05c4d554f4df6fe1bdd03c0a6e SHA-1: c6da2279548bb310c684076fa8af7da77780b9af SHA-256: 4351053d527dca192ac5e22339c00dc5cce6c8c45be8309c44c933d4b71bcb16
186 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, indicating a high likelihood of malicious intent. It contains a large number of external links, with one pointing to a suspicious domain 'soxebez.ru' and another to a file on 'strikinglycdn.com'. The PDF's structure suggests it's part of a link farm, potentially used for SEO manipulation or to redirect users to malicious content. No scripts were extracted, but the presence of external links and the overall heuristic firings strongly suggest a phishing or content-luring attack vector.

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://soxebez.ru/strik?utm_term=how+great+thou+art+chords PDF link annotation
    • http://yandex-delivery.cc/92685384911evhdl.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/stephen_king_mini_series_streaming.pdfIn PDF document text
    • http://sberpodarok2020.online/739622753011xkik.pdfIn PDF document text
    • http://timecodes.net/2012_kia_sedona_user_manualso3ye.pdfIn PDF document text
    • http://instapriz365.site/dunolitenivoxavutuwogabwy7b.pdfIn PDF document text
    • http://salonlabs.xyz/52449827402y879y.pdfIn PDF document text
    • http://tututot.mygamesonline.org/61693419769.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/a9569bb0-f115-4f19-b471-22a4c1b60241/gudogabibivekanodof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd5eda8a-d2bf-4e88-8db9-3be940e67d34/ingenuity_automatic_bouncer_recall.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0a993ba-ef10-4414-b3e9-86facd8dc8d1/kemper_profiler_power_rack_rackmount_guitar_amplifier.pdfIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_91e9cd7699514256a4fc0a0adf6293e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f74c2cf-c414-4408-ab01-932f164436cc/dan_brown_inferno_movie_ending.pdfIn PDF document text
    • https://e108c0fa-8e70-4110-aab7-e0d30777705f.filesusr.com/ugd/d9966b_c1c807d4153442a5ad37f415497d5c29.pdf?index=trueIn PDF document text
    • http://posikin.myartsonline.com/referat_orchitis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf6b01b2-6c3f-46bd-9a68-096e3fdeee79/milekixabojigizuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acdcefb0-570b-4f40-b087-2f9e994989af/how_do_i_set_the_alarm_on_my_timex_nature_sounds_clock_radio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a2ac8ceb-68ca-4337-a0a1-4b93cf3defb1/8328246586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aed23cc-5f99-40f4-aeba-278683499023/wizodimokunen.pdfIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_600b1983a80748eca2b46019390ecd1d.pdf?index=trueIn 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
stream_002_off0000d266.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD266 5224 bytes
SHA-256: 8576551aba08ea864faee33e3f9a41bcfac7ab6d252f835055ecae3655f2d21e
font_01_sfnt_off0000e435.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE435 11048 bytes
SHA-256: acc03ffecea8e98656fe63ef6d20eae745310bb4c062d2ddbcd1723ff7d35ebf