Malicious PDF — malware analysis report

Static analysis result for SHA-256 4073f497ec619b9a…

MALICIOUS

PDF

75.3 KB Created: 2021-04-01 19:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9d25e387a2933c827fc49f57175f1e8a SHA-1: d3c8175e8d7e6661988fcfd1065559954a962d2a SHA-256: 4073f497ec619b9a2db2e99a4cb49f88bf7c966a9e57aa7bf114701e77f110cd
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/strik?utm_term=2001+chevy+s10+ignition+wiring+diagram PDF link annotation
    • https://vexoxedurajawo.weebly.com/uploads/1/3/4/7/134704707/vadajevujiwosuteb.pdfIn PDF document text
    • https://wufovepujiz.weebly.com/uploads/1/3/0/7/130775368/f5745194f4.pdfIn PDF document text
    • https://jilukixewe.weebly.com/uploads/1/3/4/0/134042659/wuwereterip.pdfIn PDF document text
    • https://zedasadexim.weebly.com/uploads/1/3/0/7/130775923/2172f314a3aa8f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376879/normal_6041b70905928.pdfIn PDF document text
    • https://cdn.sqhk.co/fosuzonarefi/pVUTwVz/equivalent_fractions_worksheet_year_2.pdfIn PDF document text
    • https://xunerekube.weebly.com/uploads/1/3/0/7/130739532/rewiviwaga-worobi-sudeladefif-bepevevi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461249/normal_5ffe4653c3811.pdfIn PDF document text
    • https://vivuwugo.weebly.com/uploads/1/3/0/9/130968913/waxapujuxoxogimame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416131/normal_602dd65e65678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480736/normal_6043e715c7252.pdfIn PDF document text
    • https://cdn.sqhk.co/makulowujip/DgiP6jf/chicken_pot_pie_poultry_seasoning.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450243/normal_5ff0da5e5b284.pdfIn PDF document text
    • https://buvapubadoloj.weebly.com/uploads/1/3/4/2/134265521/kebodazilakod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488855/normal_6056c9d551e95.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412583/normal_5ffdfd80944f5.pdfIn PDF document text
    • http://tixokapine.mypressonline.com/anatomy_mnemonics_upper_limb.pdfIn PDF document text
    • https://muxazufi.weebly.com/uploads/1/3/2/6/132683336/f50bd2b70e5fc.pdfIn PDF document text
    • http://didibemez.scienceontheweb.net/chrono_trigger_remake_switch.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumurulepowele.myartsonline.com/narizizubunaxukupa.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_off0000e762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE762 5804 bytes
SHA-256: 04c958845b1bb9a7c808900650c0f520a537193b3a1fec39bdf38dbf055c18c6
font_01_sfnt_off0000fb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1C 10788 bytes
SHA-256: 600fa4c0f704b5da32cd22387d93dcb0d062129f114225017bc999ae0b8970e7

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