Malicious PDF — malware analysis report

Static analysis result for SHA-256 99843496baebc44e…

MALICIOUS

PDF

73.4 KB Created: 2020-12-25 01:18:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: bdaf7704bc705aa6ca23dc6e220f815e SHA-1: 760823143793fc8c41ea707e3daeba228f315da4 SHA-256: 99843496baebc44e8fabce88811698f43f08f43a44f19fc4e06f418f08c135e5
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file exhibits characteristics of a link farm, containing numerous external links to other PDFs hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to distribute further malware. The presence of a 'download button' heuristic further supports the idea that the document is designed to lure users into clicking links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/aws?utm_term=3d+cad++portal+partcommunity%252F+partserver PDF link annotation
    • https://nupejaxisolerez.weebly.com/uploads/1/3/4/3/134348845/6168785.pdfIn PDF document text
    • https://cdn.sqhk.co/kebubupoxiz/ihOggid/business_start_up_costs_tax_deductible_australia.pdfIn PDF document text
    • https://fipokotosa.weebly.com/uploads/1/3/4/5/134506619/furavo_girilujini_pakuwurom_dekuponin.pdfIn PDF document text
    • https://birulivalofa.weebly.com/uploads/1/3/4/0/134013213/sadajedava_tilonukome_kitupu.pdfIn PDF document text
    • https://mowolonob.weebly.com/uploads/1/3/4/8/134874237/596602.pdfIn PDF document text
    • https://cdn.sqhk.co/dozirolizilu/hicmMhc/feudalism_pyramid_hierarchy.pdfIn PDF document text
    • https://cdn.sqhk.co/zofukumane/hgghjhg/facebook_business_manager_tutorial.pdfIn PDF document text
    • https://donedujawag.weebly.com/uploads/1/3/4/3/134315137/lifaninasirig.pdfIn PDF document text
    • https://virekapowop.weebly.com/uploads/1/3/4/0/134013047/7341014.pdfIn PDF document text
    • https://cdn.sqhk.co/xibumediw/bNhjiea/6037614153.pdfIn PDF document text
    • https://vexivager.weebly.com/uploads/1/3/4/6/134634122/6074fb50.pdfIn PDF document text
    • https://dimaxafazeza.weebly.com/uploads/1/3/1/4/131453031/wotukomomig-safozepogadala.pdfIn PDF document text
    • http://partserver.deIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5978175-1233-48bb-987c-cbf6a45a8821/annalee_dolls_price_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/994df126-4541-40fd-9157-81f9a787cbe0/air_potato_vine.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_off0000e0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E1 5484 bytes
SHA-256: b8adef5796cf93456dc2f8738a97ba68d1206bf05f902bda1074598ffe07d8c7
font_01_sfnt_off0000f387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF387 10996 bytes
SHA-256: fac7012f782a4c6534729111912f9afe92d471ab8eda01630014d681717d6a98

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