Malicious PDF — malware analysis report

Static analysis result for SHA-256 6028e5367d8a6c1b…

MALICIOUS

PDF

68.7 KB Created: 2021-03-14 18:45:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: cbce8d089268ee28f37f20b4eb79dbb1 SHA-1: 54b6197e8e16f901ec85c98b7c03988922c7c595 SHA-256: 6028e5367d8a6c1b05767f7b75ccd92b49cee8b3aca3d7cf8941d5a6454c081f
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO redirectors designed to phish users or distribute malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, and 'PDF_SEO_UTM_REDIRECTOR_LINK' specifically flags an image lure leading to a redirector. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://maypoin.ru/123?utm_term=ant+middleton+the+fear+bubble+epub PDF link annotation
    • http://ridikomalav.22web.org/43958501446.pdfIn PDF document text
    • http://tenakororor.iblogger.org/huck_finn_jim_superstitious_quotes.pdfIn PDF document text
    • http://tetizeniwa.mypressonline.com/73804394711.pdfIn PDF document text
    • http://bisapusid.mypressonline.com/washington_state_football_game_on_tv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/how_to_say_moon_in_different_languages.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/guxogeseg.pdfIn PDF document text
    • http://xafafomuripag.epizy.com/gumezigafupivotoxa.pdfIn PDF document text
    • http://melotaroluna.epizy.com/pivibimabitexab.pdfIn PDF document text
    • http://wejelinemadagep.rf.gd/40106860902.pdfIn PDF document text
    • http://gubawakelu.onlinewebshop.net/how_many_electrons_in_5p_orbital.pdfIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/28824441710.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/90861556435.pdfIn PDF document text
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_9a6b1ac6cfc34b38bdc8816b749d00ef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/solonebosop/formal_language_and_automata_theory_vtu_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/swinging_safari_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/is_batman_in_dc_titans.pdfIn PDF document text
    • http://lozekav.epizy.com/how_to_start_write_a_formal_letter.pdfIn PDF document text
    • http://wagulekamiwegur.rf.gd/how_to_draw_a_mind_map_when_studying.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_off0000cf9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9A 5232 bytes
SHA-256: af63ea419966e58f3eca1cb484a9497b3e22e750af26396e591e483b3b55176b
font_01_sfnt_off0000e134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE134 10188 bytes
SHA-256: 7e04cf0274dfe1fbf8accdb73da687b7117af36bff493986bab5b6ace8458baf

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