Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb996a3c61478289…

MALICIOUS

PDF

73.5 KB Created: 2021-03-09 08:56:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 6d41acf3179472775e3b4f1149e4f873 SHA-1: 6b04d285842242fdc2c8f4ec0ab37423031e8c58 SHA-256: bb996a3c6147828995a23f8f8460103bb201bb8ea2c227ddcff099d774803936
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan distribution attempt. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the final malicious destination.

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://druttle.ru/award?keyword=vba+excel+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/bidomutarili/yLDlZji/flyff_harlequin_quest.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/fubizodesuxejilelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4529697/normal_5feaf4468c037.pdfIn PDF document text
    • https://baveretam.weebly.com/uploads/1/3/5/3/135314503/degemujoresewa_juvuvarafezij_rejolusirupux.pdfIn PDF document text
    • https://rusopuse.weebly.com/uploads/1/3/4/4/134498446/binez.pdfIn PDF document text
    • https://gikudinok.weebly.com/uploads/1/3/4/7/134730402/1072553.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480182/normal_5ffd2143ee295.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420610/normal_602430958fc92.pdfIn PDF document text
    • http://sidufapas.mywebcommunity.org/80550456535.pdfIn PDF document text
    • https://cdn.sqhk.co/fogunedevare/vzjdyiN/old_fashioned_girl_names_that_start_with_c.pdfIn PDF document text
    • https://migigagabigugam.weebly.com/uploads/1/3/0/7/130775968/8687cc52af968f8.pdfIn PDF document text
    • https://wawanuxofidote.weebly.com/uploads/1/3/0/7/130775818/9162b39685b617.pdfIn PDF document text
    • https://cdn.sqhk.co/kajutizikodu/bgd1aih/32905970933.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://divupovive.epizy.com/acrobat_star_show_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad9ef908-0ce7-454a-9811-7a98dcafce10/how_to_tie_a_ribbon_diagonally_around_a_box.pdfIn PDF document text
    • http://vuwesijodu.rf.gd/vefexavegareguvexo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6c16ec0-3539-474e-866b-b03117630407/31841283771.pdfIn PDF document text
    • http://roporuti.onlinewebshop.net/26532556048.pdfIn PDF document text
    • http://xajulazozu.epizy.com/79415413762.pdfIn PDF document text
    • http://marojinoz.rf.gd/90810363078.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad932ef4-3a49-4b85-abfa-4c58494e2f6d/windows_server_2016_troubleshooting_guide.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_off0000e336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE336 5324 bytes
SHA-256: 20d08ebd2a41a87c88b5fc5ed4315fc8941658b4700e2741b70b703f10e87634
font_01_sfnt_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 10396 bytes
SHA-256: 498560c1d24f1988328904c82f18d7b291efc0c2ee932164016cea6c0a03ec9d

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