Malicious PDF — malware analysis report

Static analysis result for SHA-256 f110a1c8cac578b1…

MALICIOUS

PDF

66.0 KB Created: 2021-03-20 15:38:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 582ab1b60cddb387e10ba8ce2324783d SHA-1: be1109103f728e9c4709ec3cef882a77141263c8 SHA-256: f110a1c8cac578b1db68a93f19dd5ada8af01be8f1482088462df4525edc3b14
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://zajinet.ru/aws?utm_term=harbor+breeze+santa+ana+ceiling+fan+light+bulb
    • https://cdn.sqhk.co/namulofilox/iiigcwF/woguzevuruw.pdf
    • https://xuzatikanuji.weebly.com/uploads/1/3/0/7/130775198/b4d254c.pdf
    • http://dedekuwetom.iblogger.org/rejadiwamuwojotumuwudujos.pdf
    • http://ruvogodozipabiv.scienceontheweb.net/32396193765.pdf
    • https://watalixajine.weebly.com/uploads/1/3/4/6/134635748/wizebawebu.pdf
    • http://felesatediz.medianewsonline.com/80950896192.pdf
    • http://rusewigojubilon.mygamesonline.org/jagegi.pdf
    • http://kidupat.getenjoyment.net/chapter_2_research_example.pdf
    • https://cdn.sqhk.co/bularalunop/41ggRgj/78390660217.pdf
    • http://vekisonoloze.sportsontheweb.net/zisijosujomosupuboga.pdf
    • https://binemipo.weebly.com/uploads/1/3/0/8/130874238/2790520.pdf
    • http://dusalawolut.iblogger.org/how_to_cook_omaha_steaks_caramel_apple_tart.pdf
    • https://cdn.sqhk.co/wuwoxegolewa/GwMYOih/mafejekem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pazatuv/87882261702.pdf
    • https://s3.amazonaws.com/bidivo/jaril.pdf
    • http://segegilomojok.epizy.com/meguvofizo.pdf
    • http://rupijelovugibiz.rf.gd/animals_and_their_young_worksheet.pdf
    • http://bexukavibume.myartsonline.com/tigaza.pdf
    • https://s3.amazonaws.com/ravuxudibure/zevenevaxogefuzuwevujedaw.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_off0000c57c.bin
b4cb0f81780003dbf15529db44ddc0fce22bc73cc3bbd6e5a30525c78bf6e504		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC57C 5296 bytes
font_01_sfnt_off0000d780.bin
50f238f0578f050fa5579c7290b0a3f5f93b34dff9b16ab3851b38c0bb0bc300		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD780 10260 bytes

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