Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b9885cf6bed690e…

MALICIOUS

PDF

80.9 KB Created: 2021-02-28 11:10:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 981125c17d22971127533362f5820ac4 SHA-1: 17e1e3a9d26ca3442c766fce5c27f110d573c6b9 SHA-256: 5b9885cf6bed690e6b63407799197efbb494f1eedd0923ba60ebb99528bfa6fe
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs are used to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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/strik?utm_term=what+is+a+normal+a1c+level+for+a+diabetic PDF link annotation
    • https://cdn.sqhk.co/rureroso/hCmsiih/jexinasewum.pdfIn PDF document text
    • https://cdn.sqhk.co/padasagam/hPlUAja/localily_buy._sell._rent._chat._local._pennsylvania.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418565/normal_6003f5b271ed9.pdfIn PDF document text
    • https://jawizadobem.weebly.com/uploads/1/3/4/7/134773472/lobiliroxewavevu.pdfIn PDF document text
    • https://sifobidegi.weebly.com/uploads/1/3/0/8/130874382/fuwulomivizuwo.pdfIn PDF document text
    • http://haifaiv.ru/vojawaneroxiaq9v6.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/ihfjhge/63076069811.pdfIn PDF document text
    • https://cdn.sqhk.co/zexupibo/icxifjg/clue_bingo_free_dice.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461766/normal_60137b5f6a4e9.pdfIn PDF document text
    • http://serikanipesemo.iblogger.org/38738253308.pdfIn PDF document text
    • https://cdn.sqhk.co/gasowifozil/ArhWpie/lawn_cutting_service_names.pdfIn PDF document text
    • https://pajixuga.weebly.com/uploads/1/3/2/3/132303126/213278.pdfIn PDF document text
    • https://resonorur.weebly.com/uploads/1/3/4/8/134874279/sibuwuviv-zebafumip-pilizo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453743/normal_5ff7ada162349.pdfIn PDF document text
    • https://fazapezipomen.weebly.com/uploads/1/3/1/4/131453522/8659172.pdfIn PDF document text
    • http://nout-sale.site/le_plus_grand_secretfm92e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://bakenexiradofo.epizy.com/51358415541.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_off0000f13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13A 5316 bytes
SHA-256: ea2a9ef38746fa999df82f993ff43b8c292aa8b5479ec2db26856fb7c64308cd
font_01_sfnt_off00010327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 11000 bytes
SHA-256: 425b9b28463bdb66084092bc8d85b738d7e961d56ec79fc8cdbfea1d40bf0873
font_02_sfnt_off00012890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12890 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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