Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac96952f20a3c629…

MALICIOUS

PDF

81.7 KB Created: 2021-05-04 05:20:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8d091b204806895ffe1de6c8efa8c096 SHA-1: 4fc22ac2bd1dc426b242d58a87be5d83f6829c8f SHA-256: ac96952f20a3c629a514dda65a943c30b78a7c20dd5f5214bac85f50f43eddbd
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with several pointing to disposable hosting and acting as a link farm, a common tactic for phishing or distributing further malware. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to obfuscate the true destination and track user interactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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 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://zajinet.ru/strik?utm_term=cloudy+with+achance+of+meatballs+2+strawberry+plush PDF link annotation
    • http://wijofotezopadik.medianewsonline.com/68016277811.pdfIn PDF document text
    • https://xojozojejaxito.weebly.com/uploads/1/3/4/8/134866115/sokojagokolasiru.pdfIn PDF document text
    • https://cdn.sqhk.co/sekigizakeku/OmZ5jhy/tavadiraxadubonovitemubu.pdfIn PDF document text
    • https://pewepexit.weebly.com/uploads/1/3/4/6/134659954/xeloxusanudabijirem.pdfIn PDF document text
    • https://vuvuzuvikedatun.weebly.com/uploads/1/3/4/5/134529562/2988896.pdfIn PDF document text
    • https://zuwojutiraz.weebly.com/uploads/1/3/4/7/134729165/6772319.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/tokyo_ghoul_release_date_anime.pdfIn PDF document text
    • http://xofelivigavas.mywebcommunity.org/allahabad_state_university_time_table_2020_bsc_2nd_year.pdfIn PDF document text
    • http://mudixefibewab.mywebcommunity.org/analytical_chemistry_for_technicians_by_john_kenkel.pdfIn PDF document text
    • https://cdn.sqhk.co/koxixoneto/ifgciLw/bivizavutoz.pdfIn PDF document text
    • https://cdn.sqhk.co/nimotixalulo/bidZjhf/18446800032.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/66798145363.pdfIn PDF document text
    • https://fowaloxew.weebly.com/uploads/1/3/4/8/134881160/lokusari.pdfIn PDF document text
    • https://temetufel.weebly.com/uploads/1/3/1/8/131856903/1097647.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/fHjdwid/76169300116.pdfIn PDF document text
    • https://cdn.sqhk.co/molipigi/as1Jjjv/11781339192.pdfIn PDF document text
    • https://wadasazaba.weebly.com/uploads/1/3/3/9/133999184/e19fcb82f5b0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kujapomib/facebook_messenger_app_desktop.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/pimedufesazewa.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/61306818449.pdfIn PDF document text
    • http://ruvemad.myartsonline.com/open_file_in_browser_html_code.pdfIn PDF document text
    • http://terumalok.atwebpages.com/adenomatous_goiter_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/battle_royale_machete.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD970 5764 bytes
SHA-256: 3414a182bef7113ecc385dafda265562ecc37dc28b6e1c0c946964b93e59bc44
font_01_sfnt_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 11608 bytes
SHA-256: 253143422a48da174af0f37392c49ee6f25b1263b59e5b610f8f065abb819a4d
font_02_sfnt_off000114f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F3 16228 bytes
SHA-256: 91a11e41b4092e9400394539ee62b63524bf83af8547c09cbbbc51a7244bbaf0
font_03_sfnt_off00012a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c