Malicious PDF — malware analysis report

Static analysis result for SHA-256 795a8b960e2a17a5…

MALICIOUS

PDF

73.8 KB Created: 2021-03-24 12:10:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f3659b41802893b1d20899385de55071 SHA-1: 17ffd2fa71532cfdd0d0fdcdf19fbe6dcd4f19e9 SHA-256: 795a8b960e2a17a5bd5361f0f0e6dd976b1b0c117999d5ec55d1e4508327eb26
186 Risk Score

Malware Insights

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

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 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://vilenefex.ru/strik?utm_term=how+to+open+a+jammed+freezer+drawer PDF link annotation
    • https://cdn.sqhk.co/bigulikexupa/hChfxZs/57345591630.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/xreicD4/apex_legends_free_for_mac.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/bjbifji/pizadi.pdfIn PDF document text
    • https://xibabajawaxas.weebly.com/uploads/1/3/1/3/131398380/a16e397dac873.pdfIn PDF document text
    • https://cdn.sqhk.co/suwixowefa/dmiijfk/62539018746.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/iiiiesC/dragon_city_takeout_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/kigoxeni/cifpyc7/switch_pro_controller_scan_amiibo.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/gNcwejf/dragon_king_bakugou_x_reader_lemon_tumblr.pdfIn PDF document text
    • https://janepaxe.weebly.com/uploads/1/3/4/0/134097288/rarowinolilona.pdfIn PDF document text
    • https://cdn.sqhk.co/pabopimi/vjejeTl/proxima_centauri_compared_to_the_sun.pdfIn PDF document text
    • https://cdn.sqhk.co/pamavunawi/jdgeK4g/huey_long_quotes.pdfIn PDF document text
    • https://wekexodaxax.weebly.com/uploads/1/3/4/7/134713384/gotiluxajapuletos.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/f9Nahdo/duwas.pdfIn PDF document text
    • https://cdn.sqhk.co/vasegodesazu/QjcIfHp/metal_horror_escape_gameplay.pdfIn PDF document text
    • https://cdn.sqhk.co/giruzegovu/Peifz7z/mobile_legends_adventure_codes_september_2020.pdfIn PDF document text
    • https://guwosifewutus.weebly.com/uploads/1/3/4/6/134616196/podoxusifobe.pdfIn PDF document text
    • http://tufurujepuduxop.22web.org/diccionario_biblico_hebreo_traducido_al_espaol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vurosija.epizy.com/denijewilutubinerozig.pdfIn PDF document text
    • http://gesuposobevexo.rf.gd/netexefasakugadomobofus.pdfIn PDF document text
    • http://xibunagevidaze.rf.gd/23551154876.pdfIn PDF document text
    • http://golujaxi.epizy.com/minivinurewuli.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_off0000e35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35B 5156 bytes
SHA-256: 8e2b575bad3374b1596ca70019972992973820d06a745bc53f494e61446ec27c
font_01_sfnt_off0000f4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4ED 10880 bytes
SHA-256: 8abac0da0563ba8b5df4d07fa7921e66b3a6e074df877eafbc6b3eb0eb440955

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