Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05efcec42b24a26…

MALICIOUS

PDF

122.2 KB Created: 2021-03-15 14:12:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1240ea2cf4100b7af9e69623dd627295 SHA-1: e6b6ad8a7e428d57aedf6fb85729847a59df7f4b SHA-256: b05efcec42b24a269f75406abfd4f33b5e406cac101772e924aefdf832a1dc5a
206 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jacksth.ru/strik?utm_term=how+much+is+mcdonald%2527s+minimum+wage+2020 PDF link annotation
    • http://axecheat7.xyz/remington_700_sps_stainless_30-06_reviewsodx40.pdfIn PDF document text
    • https://cdn.sqhk.co/disonixures/PbVgeIn/pojiveninur.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/hcEjcNz/wivovetupukus.pdfIn PDF document text
    • https://cdn.sqhk.co/dusimefosix/djgxwhb/best_racing_games_on_switch.pdfIn PDF document text
    • https://cdn.sqhk.co/xawefigi/ifjeKLE/magekekeririkexax.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/Sjdihid/from_the_sea.pdfIn PDF document text
    • http://9gusevshop.space/sarafakizadefekunuv2g1q.pdfIn PDF document text
    • http://serviceforyou.site/napoleon_hill_laws_of_success_summarywd0mb.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/3d61c89f-b665-46f1-aa23-2f938eb9ff4e/the_scarlet_letter_book_summary.pdfIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_3ff7e4302cef456b875ce802efb55fca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/055ecd7f-a452-4877-852f-2ab22a348fb7/ping_pong_rules_does_the_ball_have_to_bounce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69f33477-7c70-4ccd-a13c-890ceb27cd53/gapapaninu.pdfIn PDF document text
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_01231beee3624d82b23c248cfbbbcbf3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a46006d3-f5eb-46db-8116-31de2ea61bcc/vidow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae2aa79f-13a8-4577-9468-3e1eb07cb4e2/2988352763.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40eb1620-075c-4db8-adde-c5eb57e95145/how_does_an_investigator_prepare_for_an_interview_or_interrogation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdda0848-09e1-4e08-b122-474bdc3d3c06/25988862370.pdfIn PDF document text
    • https://dd39d194-9042-494f-90ab-223c96cf8da5.filesusr.com/ugd/5d3909_5ba49a8b4a1d49da85fc681632e18fbb.pdf?index=trueIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_d7ba2f12def64f73ab239a03e277b88b.pdf?index=trueIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_ef3c239c2fcf462fbe8e75bab0e89ed7.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
font_00_sfnt_off00019b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B3B 5620 bytes
SHA-256: 3b7339d3c9a8996516b43cdf2d6460a84ef84093f66aae10bf25d9110eadd7a7
font_01_sfnt_off0001ae4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE4A 12800 bytes
SHA-256: 924c0796c5b8255da99fab670ad666c32638aae976c8ada7be9ad345255ac2a5