Malicious PDF — malware analysis report

Static analysis result for SHA-256 975630d80063b6fd…

MALICIOUS

PDF

88.9 KB Created: 2021-02-14 11:33:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3f2f6bf03d7e480387d629b9d145ca22 SHA-1: d37e102e55d866f93c96beb12a5f693f043b25e9 SHA-256: 975630d80063b6fdfe6a0ad0b27d24b0e0d62435c647f0b21fb27bb51787dc85
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 hosted on disposable domains or link farms, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this is a phishing or malicious content delivery mechanism. No scripts were extracted, but the presence of numerous external links points towards a spearphishing attachment attack vector.

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://jacksth.ru/123?utm_term=tin+condensed+electron+configuration PDF link annotation
    • https://cdn.sqhk.co/xakurusuk/fnuXa9S/98198477965.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/1Biaid9/miro_app_review.pdfIn PDF document text
    • https://jevebuna.weebly.com/uploads/1/3/4/5/134594548/f594e11ea3.pdfIn PDF document text
    • https://cdn.sqhk.co/vekosozob/wXgiHhd/minute_to_win_it_cup_stacking_game_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/jefigujaxev/hhWQozT/pandemic_run_out_of_player_cards.pdfIn PDF document text
    • http://guburifesujera.22web.org/salosipaponi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ravesezubepad.epizy.com/82356000368.pdfIn PDF document text
    • http://lolukojalima.epizy.com/domarutorikifuw.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/28829007268.pdfIn PDF document text
    • http://jafepotafeno.epizy.com/cfft_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/piano_sheet_music_fur_elise_printable.pdfIn PDF document text
    • http://mapakipoborepuj.epizy.com/pazipamojuzumugekanet.pdfIn PDF document text
    • http://zukusuvajijip.epizy.com/khan_academy_grammar_answer_key.pdfIn PDF document text
    • http://kejefutipetube.epizy.com/jkbose_date_sheet_private_12_class_2018.pdfIn PDF document text
    • http://pidejekakej.epizy.com/kajurenef.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001082f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082F 5140 bytes
SHA-256: e28a9fefc1d3cee1a01c76385d0e4f3d3e80f77088328c68a20fc43829ea8a51
font_01_sfnt_off000119b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B3 11776 bytes
SHA-256: 88a2eb3fed5569e3992b3429ba772fa591ac3ad704963fdc86160829fa323ee0
font_02_sfnt_off00014219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14219 16036 bytes
SHA-256: 354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb

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