Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4473b7f8030706a…

MALICIOUS

PDF

95.4 KB Created: 2021-03-30 15:40:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6a652985f8b538e88cd99453420f8f6d SHA-1: 296ef36ba81617cc992733a63147550fd1a7a3a0 SHA-256: c4473b7f8030706ab3bce42ee959d98e89eaa8c5308c79c06d16ea3377fdbe90
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a significant number of external links, many hosted on disposable domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it's part of a phishing or malware distribution scheme. The embedded URLs likely lead to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://midufefew.ru/strik?utm_term=html+css+responsive+template+tutorial PDF link annotation
    • http://parazepurafeza.medianewsonline.com/mitsubishi_mr_slim_smart_thermostat.pdfIn PDF document text
    • https://bovikobugekut.weebly.com/uploads/1/3/0/7/130775803/3764675.pdfIn PDF document text
    • https://zupuluduwiwafop.weebly.com/uploads/1/3/2/6/132681460/zirosunemo-vapokorufubu.pdfIn PDF document text
    • https://cdn.sqhk.co/rijomawonuj/aevMJTP/most_wanted_racing_traffic_racer_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xupebasolaw/Sk1gf9i/61650812992.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/XQhi3ge/carnival_game_throw_ball_in_bucket.pdfIn PDF document text
    • https://cdn.sqhk.co/xorilulog/cjuTxhd/98466941647.pdfIn PDF document text
    • https://cdn.sqhk.co/kibizatududo/jdJiaHS/73985106394.pdfIn PDF document text
    • https://komibaxes.weebly.com/uploads/1/3/1/6/131606619/304c8c9d.pdfIn PDF document text
    • https://wuguruxozoza.weebly.com/uploads/1/3/4/0/134040539/tosolorusuf_linikag_relatopiguvomud_pakemikiru.pdfIn PDF document text
    • https://cdn.sqhk.co/sezunofubuzi/020nWvA/ragdoll_always_throwing_up.pdfIn PDF document text
    • https://jebomifodav.weebly.com/uploads/1/3/0/8/130874614/sasaxozalulezozomux.pdfIn PDF document text
    • https://xisezuvu.weebly.com/uploads/1/3/4/0/134096300/c6a49efba5e25a7.pdfIn PDF document text
    • https://kawuzuvom.weebly.com/uploads/1/3/1/3/131379118/xesanoguxigoso.pdfIn PDF document text
    • https://zoliparudoluja.weebly.com/uploads/1/3/4/6/134662317/4727984.pdfIn PDF document text
    • https://zivumipit.weebly.com/uploads/1/3/4/3/134317334/725125.pdfIn PDF document text
    • http://jaralet.getenjoyment.net/balderdash_game_cards.pdfIn PDF document text
    • http://pizuwujigajanen.medianewsonline.com/category_management_strategy.pdfIn PDF document text
    • https://cdn.sqhk.co/xubafofin/bfjczlG/9907886864.pdfIn PDF document text
    • https://tetunabirudav.weebly.com/uploads/1/3/0/8/130874278/pefapuxe_vukixuji_sejasofojalape.pdfIn PDF document text
    • https://cdn.sqhk.co/jebozibiru/hj2jbZF/u_haul_large_box_size.pdfIn PDF document text
    • https://litukepulaj.weebly.com/uploads/1/3/4/8/134863372/jatuvak.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/pibOgjl/xamixisadurubimuwa.pdfIn PDF document text
    • https://venefenotufawu.weebly.com/uploads/1/3/0/7/130775800/f39add2d.pdfIn PDF document text
    • https://tirevenisigagum.weebly.com/uploads/1/3/4/5/134500803/05423abfd4.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
    • http://saxarivoje.onlinewebshop.net/lirogerepedexedul.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000127cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CF 4980 bytes
SHA-256: f4305a8414ce3a52c968f5fa125bcc7a7a91d3202550a0bcd8534e8d9391ac6e
font_01_sfnt_off0001389e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389E 12164 bytes
SHA-256: 1f15595821170ddf252e7647091b364b1b6573c14966bba279db9d45598b26ef
font_02_sfnt_off000161e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161E1 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f