Malicious PDF — malware analysis report

Static analysis result for SHA-256 e843c3c1caba0813…

MALICIOUS

PDF

103.6 KB Created: 2021-02-16 17:41:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 85fc6f92590288dad1bce4a5069c4168 SHA-1: 4e41ba00e5d8dee95ad74fc1b271dfcc1d25c448 SHA-256: e843c3c1caba0813adcb3952289e16f5d3c2fcf7f4270f418876e809622c5108
126 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm and a phishing/malicious document. It embeds external URIs pointing to suspicious domains, including one that appears to be a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=central+angles+and+inscribed+angles+worksheet+answer+key PDF link annotation
    • http://gufutaca3.xyz/rupezijojutebekaxs7wl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471082/normal_5ff8dc99cd10e.pdfIn PDF document text
    • https://fumitofid.weebly.com/uploads/1/3/1/6/131637255/bubejene.pdfIn PDF document text
    • http://homebig.space/patching_system_image_unconditionally_xdah8weh.pdfIn PDF document text
    • https://ravawulivu.weebly.com/uploads/1/3/2/6/132682570/fawibifo-suzerezagad-zeruloronodow-rukorajix.pdfIn PDF document text
    • http://varistop.site/net_framework_1._1_4322_windows_10zcmue.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490738/normal_5ff620b318473.pdfIn PDF document text
    • http://webcam-model.online/namedevugokeun9vr.pdfIn PDF document text
    • http://biomanua.website/dalup0o4vo.pdfIn PDF document text
    • https://fozogefijegajor.weebly.com/uploads/1/3/1/4/131453134/wilorenovoji.pdfIn PDF document text
    • http://straponartist.com/officiating_and_coaching47unt.pdfIn PDF document text
    • http://igcopyrightclient.com/balloon_arches_houstonac25g.pdfIn PDF document text
    • http://xtrading.buzz/jelly_shift_the_gamen5jg7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pafexegud/91046196370.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/nomesofataketojakan.pdfIn PDF document text
    • https://s3.amazonaws.com/dupula/5725763664.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_off000150a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150A3 2828 bytes
SHA-256: b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a
font_01_sfnt_off00015a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A9E 5504 bytes
SHA-256: f016916bbb08d51f0ed8470a9e5e190b8d49f56dd9cbd3976063305f7b9ab16c
font_02_sfnt_off00016d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D61 10240 bytes
SHA-256: 72391166beff9719281fb509c1014a8751ce12bca3c3e08e33176836ac459ba8

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