Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bd8c315a0a2873e…

MALICIOUS

PDF

76.6 KB Created: 2021-04-10 14:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 436f937a4ef5d73692d21eae3e0865ac SHA-1: ce36ad27ec32a508b00ff85bc9c2a557b1adc976 SHA-256: 7bd8c315a0a2873e25fc27687564028de3ea34f39d64cb7347e63c6410264033
186 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous external URLs pointing to various domains, many of which are hosted on disposable or dynamically generated platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and extensive link farm suggest it's designed to lure users to external, potentially malicious, content.

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://jottigo.ru/strik?utm_term=temperate+deciduous+forest+in+india+map PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368481/normal_6065e3b5ab21d.pdfIn PDF document text
    • https://wowaximemufa.weebly.com/uploads/1/3/1/4/131453960/medokagovimuw_zuxotexag.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/Mgehfji/miroco_light_therapy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469827/normal_601ec21b3ec2a.pdfIn PDF document text
    • https://folatidaxewurel.weebly.com/uploads/1/3/4/3/134317863/marasupudupibijafok.pdfIn PDF document text
    • http://dororuminaxa.mywebcommunity.org/tuzokijarewifu.pdfIn PDF document text
    • https://fatagijow.weebly.com/uploads/1/3/5/3/135314750/zijupulom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477387/normal_5fd216e1c041b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383475/normal_6061fd860ad85.pdfIn PDF document text
    • http://select-get.top/kojuvibokesodikaxalg5xr.pdfIn PDF document text
    • https://viwoseloza.weebly.com/uploads/1/3/4/8/134861971/505599.pdfIn PDF document text
    • https://ralugegab.weebly.com/uploads/1/3/4/8/134888835/korines_lokodunamef_lifuta.pdfIn PDF document text
    • http://salonop.xyz/32519294740ga08w.pdfIn PDF document text
    • http://teachersaid.fun/kenmore_400_dryer_sometimes_not_heatingiowso.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/silozojixoxebesiwikira.pdfIn PDF document text
    • http://tells.fun/xatiji8dsr9.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/WOjijMg/48182884986.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sugosubexez/can_i_watch_live_tv_on_ipad_with_xfinity.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/narigararoxaku.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/how_do_i_reprogram_my_liftmaster_garage_door_keypad.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_off0000ee68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE68 5220 bytes
SHA-256: f153c7042bb6cb3cff38cb43b06b5e4862ac511b998c71d8cd5f88568b20a9d8
font_01_sfnt_off00010010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 10892 bytes
SHA-256: 128d599dc919fab5f1c623ce63c59c5ec4897936b0275ee9bd064ab256fb12f5

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