Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03c767edcf95ab4…

MALICIOUS

PDF

68.2 KB Created: 2021-02-27 22:02:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 3bf00fcbc7bb467e23de8e28b531440c SHA-1: 2deb28ca9448df18f2905d3ecc7e7fdd346e043b SHA-256: a03c767edcf95ab4ff141afc86492e4f6c1738c1d02c7f60d5944017fc952efe
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. Several heuristics, including PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, strongly suggest this behavior. The ML classifier and ClamAV detection further confirm its malicious nature, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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.
  • 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://golowaki.ru/award?keyword=the+long+winters+the+commander+thinks+aloud+lyrics PDF link annotation
    • https://cdn.sqhk.co/devurekon/icntgdw/54038875946.pdfIn PDF document text
    • https://cdn.sqhk.co/rexukewanej/hpDhggD/biology_board_games_project.pdfIn PDF document text
    • https://cdn.sqhk.co/livisade/PhcJria/news_to_news_viral_videos.pdfIn PDF document text
    • https://cdn.sqhk.co/butemobe/IibietO/lock_screen_shortcut_macbook.pdfIn PDF document text
    • https://cdn.sqhk.co/lilomovetum/iijc6WQ/free_cardboard_recycling_pickup_near_me.pdfIn PDF document text
    • https://kiwiwutirove.weebly.com/uploads/1/3/4/7/134707888/nivefi_mesetujufekoziw_rilinejidokaga_kutosaguzeba.pdfIn PDF document text
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/jegitex.pdfIn PDF document text
    • http://korirojasutito.22web.org/pefifetu.pdfIn PDF document text
    • http://setovewurepenu.22web.org/97896907638.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/vulasade_zazagaful_zumurawu_borolilok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://puligop.epizy.com/19459562352.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/android_auto_not_working_mazda_6.pdfIn PDF document text
    • http://jimifodapamusos.rf.gd/how_to_unlock_samsung_vrt_steam_washer.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/format_sd_card_linux_partition_windows.pdfIn PDF document text
    • http://fifomivosa.rf.gd/lidebamozovizudukuwol.pdfIn PDF document text
    • http://dixisafujanen.rf.gd/saxovonipuzitajatanuwokon.pdfIn PDF document text
    • http://pevurevakube.rf.gd/bharat_ane_nenu_songs_naa_songs.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_off0000cf10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF10 5560 bytes
SHA-256: 653398ecaaa263e246622201b42d48dc2da709f0bb54bfe08655c378d5f10266
font_01_sfnt_off0000e1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E6 9856 bytes
SHA-256: 298e0060ca34e3362235d605c27abe660df52cf19ddddab7dfeeb72c34300ce1

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