Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9dc4740fba449a9…

MALICIOUS

PDF

77.1 KB Created: 2021-03-09 22:43:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 40b9c5fd49cb5055f4ab29936bf1906d SHA-1: cd81484fbf57b61b8a3c9e53b0b08e7fc193fa2c SHA-256: d9dc4740fba449a92c9e90bae22f79f612e421184290672461dc06cbe06b47dc
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URL 'https://midufefew.ru/strik?utm_term=harmony+dreamtime+car+seat+instructions' is the primary IOC, masquerading as legitimate instructions to lure victims.

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://midufefew.ru/strik?utm_term=harmony+dreamtime+car+seat+instructions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369522/normal_5fd710874b19c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457272/normal_603f853377de9.pdfIn PDF document text
    • https://cdn.sqhk.co/fokapalo/fhcShjW/84824239748.pdfIn PDF document text
    • http://dalnoboyi.xyz/wemalfqjxz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421330/normal_5fe9a7e8cc024.pdfIn PDF document text
    • http://artistichomesolutions.com/84487397788hs7px.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414847/normal_5ff60d58b1a05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413838/normal_6045c20d66085.pdfIn PDF document text
    • https://cdn.sqhk.co/xenotami/dYhh2gf/lumigebafuluxuxuvupoduzo.pdfIn PDF document text
    • https://ziwegakesamud.weebly.com/uploads/1/3/4/4/134468237/6d0e0b11ce.pdfIn PDF document text
    • https://cdn.sqhk.co/noxutuvixi/aR1gfoW/the_burger_shoppe_geneva_il.pdfIn PDF document text
    • http://losinglotterynumbers.com/brother_xr9500prw_reviewhul41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459645/normal_5fdc28f2b386c.pdfIn PDF document text
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/7317605.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489730/normal_603e2d9c0d856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417995/normal_601491663ad90.pdfIn PDF document text
    • http://tryplafond.xyz/minecraft._net_server_1._13sq2oc.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/libowebujakux/what_is_a_free_motion_sewing_machine.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/brawl_stars_hack_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/pibabopuduj/comdial_dx-_80_supervisor_guide.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_off0000f085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF085 5116 bytes
SHA-256: ff91bb26fe9762c12a9c54a8e0188b27a7369895cc535cbc05d1478591f8a741
font_01_sfnt_off000101da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DA 11084 bytes
SHA-256: ab7d9845efaa4c6390cab89e6472e2dac1243eaf6414ac913ab4c5a8276b9ec9

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