Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdedf5bd3a3531a3…

MALICIOUS

PDF

73.5 KB Created: 2021-03-22 14:43:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fe85989023651cb480e7efc4acec9b7 SHA-1: defa5c4eb4cd9cc5720b5f6683ec9ef94efb3efa SHA-256: fdedf5bd3a3531a3cf717d10abe775c7acce65e38036b60e3123900da038dcfd
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One of the embedded URLs is `https://lozipotod.ru/aws?utm_term=does+vizio+smart+tv+have+bluetooth`, which appears to be a lure to a site offering information related to smart TV Bluetooth capabilities. No scripts were extracted, but the PDF structure and link farm behavior are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/aws?utm_term=does+vizio+smart+tv+have+bluetooth
    • https://noparerekum.weebly.com/uploads/1/3/4/6/134639333/wujul-mizov.pdf
    • https://tamagokevalagir.weebly.com/uploads/1/3/0/7/130776783/5344948.pdf
    • http://neip-forum.fun/dajezanadapujirerinajerux9rf28.pdf
    • https://xidelesa.weebly.com/uploads/1/3/4/4/134498911/jejolanaf-batusiridin.pdf
    • https://gazuxupoje.weebly.com/uploads/1/3/4/1/134108966/tutamela-karixotumag-lalop-miwetoxuz.pdf
    • http://prechambre.xyz/internet_radio_software_free26xkt.pdf
    • https://tinutenuku.weebly.com/uploads/1/3/4/6/134664278/lepuzolaxumepur_gakukepuzigujib.pdf
    • http://pilefud.iblogger.org/vupixex.pdf
    • http://loveantravel.xyz/does_vizio_tv_support_bluetootheg72e.pdf
    • http://canlisohbetim.net/29295926189k42qm.pdf
    • http://lolafoduluj.22web.org/kindle_app_for_ipad_9._3._5.pdf
    • https://sabidodavo.weebly.com/uploads/1/3/1/4/131408103/6799987.pdf
    • https://xoverepidagagit.weebly.com/uploads/1/3/4/4/134469055/13059.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://likewiwojuxus.atwebpages.com/simbologia_de_diagrama_de_flujo_y_su_significado.pdf
    • http://pidosowot.epizy.com/classic_wow_engineering_guide_goblin.pdf
    • http://ziboporo.epizy.com/84593485087.pdf
    • http://weguxuwe.epizy.com/bus_map_bangkok.pdf
    • http://wejufutaz.onlinewebshop.net/xinezazinazomuti.pdf
    • http://bidififi.rf.gd/physics_punjab_textbook_for_class_11.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_off0000e206.bin
1ed93b0578894ac62be94fd3aec9ef5bc9b145dbcd7bcf733d251ea809f0036f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE206 5172 bytes
font_01_sfnt_off0000f381.bin
1224c7cca00535f88e9218a3e9fc41f2ab64f09635b75c90aa92615f114d8a31
pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 10948 bytes