Malicious PDF — malware analysis report

Static analysis result for SHA-256 888aa654c0ea3f6f…

MALICIOUS

PDF

93.3 KB Created: 2021-03-15 05:17:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 37be5fc28ac94bf42d3836d977725b1d SHA-1: 4d33f090effff545d303bbe9a92a8e5ab89950dd SHA-256: 888aa654c0ea3f6f5efd7d4a311b0b2393360b23993853fbb0110f1b0929e923
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a specific PDF search term, suggesting a phishing or social engineering attack.

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://vilenefex.ru/award?keyword=bartleby+the+scrivener+pdf+espa%25C3%25B1ol PDF link annotation
    • http://kersita.fun/xifagelekatunenevir7f3.pdfIn PDF document text
    • http://studyweb.site/forge_of_empire_hacksjgtxv.pdfIn PDF document text
    • http://coolvdomaion.online/try_to_praise_the_mutilated_world84z5u.pdfIn PDF document text
    • http://parkji5x.xyz/blade_inductrix_fpv_hd_troubleshootingz2wkv.pdfIn PDF document text
    • http://fruittea.space/are_sinkholes_common_in_californiancg1p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_600deb708d1fc.pdfIn PDF document text
    • http://beach-fruit.fun/68752657507s3vay.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450424/normal_5fee3179ab089.pdfIn PDF document text
    • http://g2am2e.xyz/bodedisibunuxagezedirydsiy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383137/normal_5fe0be16786c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450247/normal_602896e21b145.pdfIn PDF document text
    • http://goromeo.club/82272371335azgc3.pdfIn PDF document text
    • http://pomirkapa.site/difference_between_layer_1_and_layer_2_devices6n48p.pdfIn PDF document text
    • http://casbah2point0.com/the_work_of_art_in_the_age_of_mechanical_reproduction_bookjydoa.pdfIn PDF document text
    • http://trendmobile.ru/wumukuranv66et.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476943/normal_5fc88387896a6.pdfIn PDF document text
    • http://knitfqph.site/842313068781k9e3.pdfIn PDF document text
    • http://samettemiz.xyz/gupobisogekovopile1l24r.pdfIn PDF document text
    • http://pro-komp-master.website/alto_shaam_halo_heat_manualc89bb.pdfIn PDF document text
    • http://ideaita.fun/anti-_aircraft_definition_examplecym6m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zaxalamel.rf.gd/52548036033.pdfIn PDF document text
    • http://lapojuvide.epizy.com/volkswagen_vanagon_repair_manual.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_off00012c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C07 5804 bytes
SHA-256: 619ed2a3f8af9f87116b7cf9b19c76301145ede1dcee81c9c5321b3958e07e05
font_01_sfnt_off00013f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8D 11604 bytes
SHA-256: b07c48cad4955a7f5e0521df0e141931f06e7818caa821f47fd317e9299f32b3

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