Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3d837231e333e17…

MALICIOUS

PDF

99.6 KB Created: 2021-05-09 20:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93e7163957f023b927d2e4b343630981 SHA-1: ba764feaf3972966d65050538aa8f1b915cd6521 SHA-256: f3d837231e333e17faba403be8ffe79cfdddfa1440670b2b1321ccbca67e5735
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to seemingly unrelated PDF documents, indicating a link farm for SEO manipulation or to host malicious content. One prominent external URI, https://jumiwimov.ru/strik, is likely a phishing or malware distribution endpoint. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=schlage+connect+camelot+touchscreen+deadbolt+with+built-in+alarm+and+handleset+grip
    • https://cdn.sqhk.co/ginijetemepa/gheS9gd/rank_in_smash_ultimate.pdf
    • https://cdn.sqhk.co/jilebodetifa/igAhigC/motaratosenamubebuxopi.pdf
    • https://joxetoxuluf.weebly.com/uploads/1/3/4/3/134391367/bovepotamonoviko.pdf
    • https://jebapawobukil.weebly.com/uploads/1/3/4/5/134521284/a14e7f4.pdf
    • https://cdn.sqhk.co/rufadexu/hcWT3BW/temika.pdf
    • https://zitudoxe.weebly.com/uploads/1/3/1/4/131437236/467672.pdf
    • https://cdn.sqhk.co/nadovexum/ghnifjc/board_size_and_firm_performance_in_malaysia.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4c7dafe4-1fac-4fc5-8c02-3817cda0cf1e/osprey_cove_homeowners_association.pdf
    • https://s3.amazonaws.com/dowavelaxam/10584545673.pdf
    • https://uploads.strikinglycdn.com/files/defc6b29-51db-4715-afd5-9e5fa435196a/168876847.pdf
    • https://uploads.strikinglycdn.com/files/ea8495d9-f696-4c16-9bda-ddb898a77d66/where_to_donate_toys_nyc.pdf
    • https://s3.amazonaws.com/dozuga/bvg_india_limited_company_information.pdf
    • https://uploads.strikinglycdn.com/files/a7c65c1c-6c0e-4a5c-9425-edfc1ffea91c/left_handed_ukulele_chord_chart.pdf
    • https://s3.amazonaws.com/panokojol/background_power_point_tema_islam.pdf
    • https://s3.amazonaws.com/mubefula/why_did_some_die_in_infinity_war.pdf
    • https://uploads.strikinglycdn.com/files/7794d38b-dcfa-4282-93e4-8c9c70d53bf1/kixupugukuji.pdf
    • https://s3.amazonaws.com/zifozujiwi/interior_decoration_company_profile.pdf
    • https://s3.amazonaws.com/xufaxoferugod/30594017346.pdf
    • https://uploads.strikinglycdn.com/files/3428693a-bebd-4515-8725-f444f3ed35cc/uncovering_student_ideas_in_primary_science.pdf
    • https://uploads.strikinglycdn.com/files/496a4cfd-9cb2-4557-836d-4fbf7396ccee/what_is_the_literal_meaning_of_the_poem_my_papas_waltz.pdf
    • https://uploads.strikinglycdn.com/files/ca328a29-06da-4cab-886c-2f95589a981b/69000621211.pdf
    • https://uploads.strikinglycdn.com/files/80f35e96-f5d3-4ead-a7bc-c68692ac9b91/jivubadower.pdf
    • https://s3.amazonaws.com/pobixedele/bazux.pdf
    • https://uploads.strikinglycdn.com/files/6953b7ba-4e8c-49ec-baa1-cfc080926a3e/diary_of_a_wimpy_kid_series_book_list.pdf
    • https://s3.amazonaws.com/vifusupegiza/23119021047.pdf
    • https://s3.amazonaws.com/wutisigila/32948621173.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_off000141e4.bin
fdde4c801e1d69387c3ffe93b0a299e71ea6e29549d19385bbd365c67e66f4b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x141E4 5852 bytes
font_01_sfnt_off000155b9.bin
1e73fade193618cc976ca5d8a3b329ee8cb2a6652601c5db2a1f56aa590f2750		 pdf-font-stream PDF embedded font (sfnt) at offset 0x155B9 12572 bytes

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