Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10195da071b3b2a…

MALICIOUS

PDF

73.4 KB Created: 2021-04-03 23:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d3fd6856f75c8f7765028952f7d738be SHA-1: a168945a68b1e0d29ad58d1814d0b27a3f817297 SHA-256: b10195da071b3b2ac40bc83fc7cd730e6bea330458fc31ba671a67877e3cfeb9
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/123?utm_term=action+verb+practice+worksheets PDF link annotation
    • http://fito4ka.xyz/genesis_v2100_mountain_bike_for_salei1pux.pdfIn PDF document text
    • http://tonagruz.ru/83742196492i2pxr.pdfIn PDF document text
    • http://zzzmmmmejjj.space/xejukedepabisizolom713bj.pdfIn PDF document text
    • http://lofipuxokuw.22web.org/murufemejefezidux.pdfIn PDF document text
    • http://gomededow.22web.org/275709627.pdfIn PDF document text
    • http://gmetry.online/rinirofagebagtqzzj.pdfIn PDF document text
    • http://joxezorov.mywebcommunity.org/79293148607.pdfIn PDF document text
    • http://ing-jobs-opportunities.com/yaesu_ft-857d_owners_manual7zavm.pdfIn PDF document text
    • http://sovetnik53.ru/71536329680qu7z1.pdfIn PDF document text
    • http://shop-you.xyz/78622012540xgovf.pdfIn PDF document text
    • http://pipabineki.22web.org/nike_believe_in_something_meme_template.pdfIn PDF document text
    • http://xojavuwolow.22web.org/adverbios_de_frecuencia_en_ingles_y_espaol.pdfIn PDF document text
    • http://women-ita.space/student_worksheet_compound_interest_answer_keyu4x9l.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://marurutefa.atwebpages.com/sarawavu.pdfIn PDF document text
    • http://puzuniposodaf.epizy.com/2003_saturn_l200_repair_manual.pdfIn PDF document text
    • http://mokowiwar.rf.gd/oracle_sql_to_date_format_code_appears_twice.pdfIn PDF document text
    • http://finubebaguj.rf.gd/779606696.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/94445257822.pdfIn PDF document text
    • http://purupuladufuba.rf.gd/feeding_guidelines_for_one_year_old.pdfIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/fozopi.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_off0000e1dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DD 5336 bytes
SHA-256: ea781cb02b565a2edf87588883653a2560e2b10aff146b0ca8286f86c987d23a
font_01_sfnt_off0000f415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF415 10776 bytes
SHA-256: 93d70c35857a10e2675f24b861ed4849239dea1654db321349e5c3d8c52f7a94