Malicious PDF — malware analysis report

Static analysis result for SHA-256 2510de830ab2c95a…

MALICIOUS

PDF

79.3 KB Created: 2021-03-22 09:54:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 4aed6caef99405323e4cf44eff44b076 SHA-1: 50cce896fb393e25125b297659c62fc6adbaa509 SHA-256: 2510de830ab2c95aa9b276b205397ec65f83a438b3bd5f85abbf8d30085eedc9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links to other PDF files hosted on disposable domains, a common tactic for phishing or distributing further malware. The presence of many external links and the use of disposable hosting strongly suggest a malicious purpose.

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://xajibur.ru/strik?utm_term=gluten+free+breakfast+ideas+for+babies PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481515/normal_6045b9ce7b2e8.pdfIn PDF document text
    • http://xapiduxirob.mywebcommunity.org/can_you_calibrate_an_infrared_thermometer.pdfIn PDF document text
    • http://getegenufiduso.66ghz.com/fotujubewuluzowukugax.pdfIn PDF document text
    • https://rujazako.weebly.com/uploads/1/3/4/4/134471695/kujukaji_kakoto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383688/normal_6046768fe2302.pdfIn PDF document text
    • http://mon-fortuneo.best/pathfinder_sword_and_board_fighter0geet.pdfIn PDF document text
    • https://xejukogafowoje.weebly.com/uploads/1/3/2/6/132682905/36d641febe0d4.pdfIn PDF document text
    • https://pijaremurepapo.weebly.com/uploads/1/3/1/4/131406688/tevitusatugadu.pdfIn PDF document text
    • http://aycotoro0.xyz/muxaraf5prx.pdfIn PDF document text
    • https://kowupozot.weebly.com/uploads/1/3/4/8/134887449/1010a.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/what_machines_are_in_planet_fitness.pdfIn PDF document text
    • http://nepojar.22web.org/x_ray_body_scanner_free.pdfIn PDF document text
    • http://saduzemed.mypressonline.com/bookmark_template_printable.pdfIn PDF document text
    • http://zajiledafalam.getenjoyment.net/obecn_a_anorganick_chemie.pdfIn PDF document text
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/radananov-jobilotaloxi.pdfIn PDF document text
    • http://beliyden.xyz/ap_assembly_elections_2019_candidates_lists0x82.pdfIn PDF document text
    • https://gawufuxawejax.weebly.com/uploads/1/3/1/8/131855981/befaredidomomigoz.pdfIn PDF document text
    • https://fixemebipufuw.weebly.com/uploads/1/3/4/1/134131586/d7b61954.pdfIn PDF document text
    • http://shoop-fm.ru/19865486979e7xvt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nunavaxukozu.onlinewebshop.net/depikatusizakozanifir.pdfIn PDF document text
    • http://tolibewi.epizy.com/93890355030.pdfIn PDF document text
    • http://jabekafu.epizy.com/format_of_formal_letter_in_english.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_off0000f9f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F0 5136 bytes
SHA-256: 38206ed77cbbcd2b432c3025305b7122a4a61be60eac61c0215c92bedc995ed9
font_01_sfnt_off00010b78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B78 10800 bytes
SHA-256: b68717a1aa861d84f29bdb57d7526e12ee185c5ccfece3cb0eb25b89645d61b4

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