Malicious PDF — malware analysis report

Static analysis result for SHA-256 65f08a5815139ce5…

MALICIOUS

PDF

75.7 KB Created: 2021-03-21 05:57:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4741a624227198519b0a0a14c98eecb1 SHA-1: 27367841ab300e84ca3ab388cd2e7fff24090e13 SHA-256: 65f08a5815139ce5ebd387a021e2ea79c1585a8f8fecdbf5fc564f05d9200ff3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and hosted on services like sqhk.co and weebly.com, indicating a link farm designed to redirect users. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM firings strongly suggest this malicious intent. While no scripts were explicitly extracted, the ML classifier and ClamAV detection, along with the URL patterns, confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://midufefew.ru/strik?utm_term=what+is+the+best+21+inch+self+propelled+lawn+mower PDF link annotation
    • https://cdn.sqhk.co/dotituke/je5idKL/97489591530.pdfIn PDF document text
    • http://prod-fruit.space/manosozofogonufovuzew1uck.pdfIn PDF document text
    • http://inostrana.com/zekenixanajaxenilemikulgrtgp.pdfIn PDF document text
    • https://tebojejuket.weebly.com/uploads/1/3/4/7/134764489/redubunutupijewo.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/inNiaib/19931348937.pdfIn PDF document text
    • https://foguvebosep.weebly.com/uploads/1/3/5/3/135315209/3803d0e3d644.pdfIn PDF document text
    • https://cdn.sqhk.co/loziromegon/ggSKiar/planet_fitness_apple_valley_ca.pdfIn PDF document text
    • https://cdn.sqhk.co/zetikitor/Wcjjjcb/epl_top_scorers_so_far_20_21.pdfIn PDF document text
    • http://tur8osale.site/sezanolidubuvuxugorelsgktf.pdfIn PDF document text
    • http://1ux.site/91610684406fcktr.pdfIn PDF document text
    • http://construt.site/40674018223gs58i.pdfIn PDF document text
    • http://devgame.design/koxametotf6g80.pdfIn PDF document text
    • http://grantmedica.ru/a_history_of_western_music_freegyy1z.pdfIn PDF document text
    • http://clyb-wylcan3.space/supervisor_duties_and_responsibilitiesercli.pdfIn PDF document text
    • https://cdn.sqhk.co/jisokemefaz/ahfiihb/96369959358.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_fd44725cae434918b7395897f8faf40e.pdf?index=trueIn PDF document text
    • https://176fe727-baa2-4f6f-8ab0-cddcd97ecb74.filesusr.com/ugd/45df28_add7b3ffea964da9a4f7b2f3ceee8156.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f845d1c2-a19f-4a20-a98e-cab66fa2192e/why_is_management_science_important.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d8ffc07-d364-4a5f-bdf9-87d98b8b031b/vatogesesose.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_7bc0f9bd29434e60a99bb2de1ae7e5c9.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_off0000e82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82B 5824 bytes
SHA-256: 7fe050ae3cf8587c265cd67b40855fff531448cd6ecb5b5fbc8087f0747c6348
font_01_sfnt_off0000fbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF7 11024 bytes
SHA-256: e3d060079e0957bf38529fbbe500e2dcfc23fa968e69d3992fb8ba8f50c0c415

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