Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe21a939e0aead0…

MALICIOUS

PDF

78.9 KB Created: 2021-03-23 04:02:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0ef70526da8e8b0281c88c08297abc9 SHA-1: dbde33de3e182233c871c990d1e55aa8fcc2ce21 SHA-256: cfe21a939e0aead084c522083e201c0574722a2190d714807b0f7fe03f97a4ef
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical finding for a large external link farm. The ML classifier and ClamAV also identified it as a phishing or malicious PDF. The document contains numerous embedded URLs pointing to external sites, suggesting an attempt to redirect users to potentially harmful content or for SEO manipulation. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/award?keyword=pneumonia+types+pdf
    • https://sumiloruxefeme.weebly.com/uploads/1/3/2/8/132814276/buwamaxaputu-fexut-ranome.pdf
    • https://kimimidinom.weebly.com/uploads/1/3/1/4/131453749/fubik_xatigolasabib.pdf
    • https://cdn-cms.f-static.net/uploads/4414156/normal_60435362cf740.pdf
    • https://mebedepubini.weebly.com/uploads/1/3/0/8/130813558/3364378.pdf
    • http://kungfumalibu.com/gorum1k24k.pdf
    • https://fupuvoriru.weebly.com/uploads/1/3/4/4/134494751/porimulisa.pdf
    • https://static.s123-cdn-static.com/uploads/4391303/normal_5ff0bf46358e7.pdf
    • http://boomerangoo.site/exploring_psychology_in_modules_9th_edition_yeariuyc4.pdf
    • https://cdn-cms.f-static.net/uploads/4366989/normal_6042e01106dbd.pdf
    • https://miwolugakibu.weebly.com/uploads/1/3/1/3/131383652/574fb5.pdf
    • https://lokanasa.weebly.com/uploads/1/3/5/2/135299929/2896271.pdf
    • https://cdn-cms.f-static.net/uploads/4390383/normal_600d2563a49b8.pdf
    • http://mantenancie.com/64254520393ok399.pdf
    • https://wajegeteb.weebly.com/uploads/1/3/4/8/134896445/fowegulededajelu.pdf
    • https://fijuxibafituwu.weebly.com/uploads/1/3/4/1/134109117/4581801.pdf
    • http://samo-katim.ru/pipoxozefivuvetiza87myl.pdf
    • https://cdn-cms.f-static.net/uploads/4366063/normal_5fd9077140dbd.pdf
    • http://7lessons.space/black_ink_not_printing_epson_l120fasc2.pdf
    • http://grusha.space/strawberry_green_tea_bubble_tea_recipexxtor.pdf
    • https://xikofekukinakij.weebly.com/uploads/1/3/2/6/132681309/wapexezokesi.pdf
    • http://sevastopol.sale/75091867810slbeh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/niporofez/backlog_form_date_msbte.pdf
    • https://s3.amazonaws.com/jefazaxal/52213641953.pdf
    • https://s3.amazonaws.com/padadutiseni/faa_obstruction_lighting_guidelines.pdf
    • https://s3.amazonaws.com/zarusegibitumet/zusovifipobovalojojejoxa.pdf
    • https://s3.amazonaws.com/gopuze/anthropologie_formal_dresses_sale.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f814.bin
a2dd4475f1a898dd0fa7ecfebe4528ac88ac55f1fa54c9ae2ed10cc91abc3b23		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 5160 bytes
font_01_sfnt_off0001099f.bin
cbe81c148b4db740fea89e05ea3a31ddac1105e9053d13651b51987f95b972a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1099F 10424 bytes

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