Malicious PDF — malware analysis report

Static analysis result for SHA-256 785e5abbed3c166f…

MALICIOUS

PDF

75.0 KB Created: 2021-02-24 13:48:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 5ae322172bcacf5c557756f3860e6285 SHA-1: d519c720f66f5893ee8e5eb55b1377d2a4c5a3f5 SHA-256: 785e5abbed3c166f2c93ffed8df56b7f842296ef9377d43d2da5a14c434f09fc
244 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to potentially malicious redirectors and disposable hosting sites, suggesting an attempt to lure users to external malicious content. The presence of a link to a known malicious redirector infrastructure further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=was+a+real+bear+used+in+the+revenant In PDF document text
    • http://detonicufficiale.website/the_girl_with_the_dragon_tattoo_swedish_castbr9ay.pdfIn PDF document text
    • https://xomilazarega.weebly.com/uploads/1/3/4/5/134511507/6908248.pdfIn PDF document text
    • https://jefanumu.weebly.com/uploads/1/3/4/8/134889008/zedaxorosuzep.pdfIn PDF document text
    • https://sasofisapen.weebly.com/uploads/1/3/4/5/134590640/d79ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381083/normal_60325f03260e1.pdfIn PDF document text
    • https://povaxabo.weebly.com/uploads/1/3/5/9/135976235/bovokukatorawadi.pdfIn PDF document text
    • https://mekowisegopoju.weebly.com/uploads/1/3/5/9/135963570/6430171.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/fodinixa.pdfIn PDF document text
    • http://mysteps.online/39082747376vgr0l.pdfIn PDF document text
    • https://bigufoxorifef.weebly.com/uploads/1/3/1/8/131871864/govun_wapona_febematura.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381964/normal_5fcee8aacbd33.pdfIn PDF document text
    • https://rexakutomas.weebly.com/uploads/1/3/0/7/130739652/pejagow.pdfIn PDF document text
    • http://yourbigdick.space/wurubunorgzvos.pdfIn PDF document text
    • https://walugudosesex.weebly.com/uploads/1/3/4/6/134608180/wukinexiteza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447912/normal_5ff7d7cf7c039.pdfIn PDF document text
    • http://fakaripeti.xyz/how_long_can_baby_use_pack_n_play_bassinetgt2vl.pdfIn PDF document text
    • https://pizovepe.weebly.com/uploads/1/3/5/3/135323062/tivivu-wogivedawido-fisog-rixejaruvo.pdfIn PDF document text
    • https://mekowoto.weebly.com/uploads/1/3/0/7/130738632/3152981.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuboxigaxa.rf.gd/besan_flour_nutrition_information.pdfIn PDF document text
    • http://wevikokuzufos.epizy.com/82217799651.pdfIn PDF document text
    • http://mefowoweman.epizy.com/xoranulizebejuwanogag.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_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 5128 bytes
SHA-256: 06e65051c90cddae48cceaebcdd5d8d0b2a4f982488791b05b92eddd758a0377
font_01_sfnt_off0000f710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 11740 bytes
SHA-256: 0d29112c89b15b203ac7bcb197f48cfb6095854ce365570a0ed1db2598679343