Malicious PDF — malware analysis report

Static analysis result for SHA-256 b253a15f797145cb…

MALICIOUS

PDF

74.7 KB Created: 2021-03-06 15:44:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a422c8379ae2f9b10b484dfa91141fb8 SHA-1: 42dc8998617e3efccbe5a16d76c6b689e4353a54 SHA-256: b253a15f797145cb3e256254257a233ffc5e7f9bb1623bc3b1099f504493c833
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a non-clustered link farm on disposable hosting, further supporting a malicious intent to redirect users. While no scripts were explicitly extracted, the presence of external links and the overall heuristics strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/wix?keyword=bushnell+sportview+4x32+review PDF link annotation
    • http://bioforcecolumbia.site/linksys_ea2700_reset_default_passwordyl7mx.pdfIn PDF document text
    • http://liketime.online/does_hulu_have_crazy_stupid_lovekvx1f.pdfIn PDF document text
    • http://goromeo.club/hd_aquarium_screensaver_freevcpka.pdfIn PDF document text
    • http://xrootunited.com/eastern_europe_travel_guide_lonely_planet7rkbn.pdfIn PDF document text
    • http://xodaxedepapopox.mygamesonline.org/25193083030.pdfIn PDF document text
    • http://takinodexitimax.22web.org/how_much_does_it_cost_to_fix_a_cracked_samsung_tv_screen.pdfIn PDF document text
    • http://b0xberry.online/6191831703hq0t3.pdfIn PDF document text
    • http://olivamebel.com/99003863907wmadq.pdfIn PDF document text
    • http://winoorama.website/laretl1aqc.pdfIn PDF document text
    • http://badge-verification-center.com/19214306659xz23s.pdfIn PDF document text
    • http://trikolor.site/fizufusibajubotpjj9.pdfIn PDF document text
    • http://tasunixupowife.66ghz.com/40296147607.pdfIn PDF document text
    • http://abzac.me/why_is_my_heated_blanket_remote_blinking60kbv.pdfIn PDF document text
    • http://repaircreditscore.info/java_windows_10_x64bp6qq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xixovunutev.epizy.com/28623400691.pdfIn PDF document text
    • http://vokenijor.rf.gd/jarupopukigebakobe.pdfIn PDF document text
    • http://gekabogaramal.rf.gd/php_ecommerce_website_project.pdfIn PDF document text
    • http://pidukuniwid.epizy.com/4924619633.pdfIn PDF document text
    • http://savejanaxejov.rf.gd/vidokividomesobu.pdfIn PDF document text
    • http://wifofevowogak.onlinewebshop.net/buvul.pdfIn PDF document text
    • http://sudewepizetego.epizy.com/69480507746.pdfIn PDF document text
    • http://dulibifusarumo.rf.gd/aircraft_accident_investigation_report_writing.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_off0000e680.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE680 5348 bytes
SHA-256: 508c5d1da83ff3aef1101de62c60ec41e41e310fcfb0550e47888748ac3836a0
font_01_sfnt_off0000f8d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D2 10716 bytes
SHA-256: 517fe0d954faa2d5372b347416f0330a77746cf21d1a13381e5da5c2194f9683

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