Malicious PDF — malware analysis report

Static analysis result for SHA-256 1929a5e0ed78ee80…

MALICIOUS

PDF

80.1 KB Created: 2021-03-22 04:01:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb2ed30de58d1f3e4264b7a987370122 SHA-1: ebd97ccfc869ca9efb8469936efac1d3eecf2193 SHA-256: 1929a5e0ed78ee801f704512837a44efceeb99e101589b4d8e3352bd0f0d3b2f
186 Risk Score

Malware Insights

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

The PDF document contains a lure related to resetting a Kindle, but its primary function is to act as a link farm, directing users to numerous other PDF files hosted on various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via the linked PDFs. No scripts were extracted, but the PDF structure and embedded URLs suggest a phishing or content-scraping attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • 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://dafemum.ru/strik?utm_term=how+to+reset+a+frozen+kindle
    • https://xuzizalebu.weebly.com/uploads/1/3/4/7/134772475/vodasutuboxezo.pdf
    • https://vokarojunez.weebly.com/uploads/1/3/2/6/132696330/xizaligojowepebevoba.pdf
    • https://povefedonigo.weebly.com/uploads/1/3/1/6/131637150/6643991.pdf
    • https://static.s123-cdn-static.com/uploads/4490377/normal_6007428268a40.pdf
    • https://cdn-cms.f-static.net/uploads/4459324/normal_5fd26265a6495.pdf
    • https://kigodebilak.weebly.com/uploads/1/3/5/2/135297846/gexet-pijeparurenos-kavagurozeza.pdf
    • https://cdn-cms.f-static.net/uploads/4446399/normal_601ee6834b62d.pdf
    • http://balifruit.com/20929254809tyyaa.pdf
    • http://themarkuzmusic.com/the_power_of_one_penny_reynolds1q7mj.pdf
    • https://cdn-cms.f-static.net/uploads/4463306/normal_603546a798aeb.pdf
    • https://fuxarudoniw.weebly.com/uploads/1/3/5/3/135350341/vazenag.pdf
    • https://kagesurofuzesik.weebly.com/uploads/1/3/5/3/135303772/d0ffa99.pdf
    • http://natikolom.site/dragon_ball_z_goku_vs_android_18k43xk.pdf
    • https://cdn-cms.f-static.net/uploads/4450350/normal_601bfc4a384cc.pdf
    • https://fotelosalif.weebly.com/uploads/1/3/4/4/134463398/tukofigibomesig.pdf
    • http://podjem2.club/xefeketibakemc9zn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zebepojeguxeb.epizy.com/11430604681.pdf
    • http://gesesasogibigaw.rf.gd/bible_app_good_news.pdf
    • http://livukuxuperum.epizy.com/brisbane_tv_guide_motogp.pdf
    • http://timaroxakex.epizy.com/jee_main_2016_marks_vs_rank.pdf
    • http://lanadofebanubod.epizy.com/wotesefepebid.pdf
    • http://bopadem.rf.gd/interior_designer_near_me_uk.pdf
    • http://telebil.rf.gd/74612334570.pdf
    • http://nawatelobuj.rf.gd/building_electrical_maintenance_manual.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_off0000f9b2.bin
814f9f053f6bcda9adf0b091552330d136c9f1a77e340a548409966c47c42203		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B2 5068 bytes
font_01_sfnt_off00010b16.bin
aef7dc795b2ecf7de5b2ab4cfec0f4226fe88c9c31bce12e1bd2b919911bc947		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B16 11124 bytes

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