Malicious PDF — malware analysis report

Static analysis result for SHA-256 035f73bdd1ba2232…

MALICIOUS

PDF

75.0 KB Created: 2021-03-18 13:12:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3f4ad5b48f1696b6ebdb30061f014ec7 SHA-1: 7f746a0bc01f0cc3b9ca8d5738d88b8c90054491 SHA-256: 035f73bdd1ba22327731ba6147ce7da740f9a7b1cfaae5cd62fa846d38fe0460
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous external URLs, likely intended to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to computer hardware engineering schools, suggesting a phishing attempt to gather information or lead users to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dugedepap.ru/aws?utm_term=computer+hardware+engineer+schools+in+texas
    • https://deriwofapavuz.weebly.com/uploads/1/3/4/3/134311795/wufonorofuwiw-zinav-zevevaja-lesadajepozixe.pdf
    • https://static.s123-cdn-static.com/uploads/4426090/normal_5ffc89db159e3.pdf
    • http://bellissimo.online/bpsc_assistant_online_form_2018bi5zr.pdf
    • https://xuxulavadimuxa.weebly.com/uploads/1/3/4/2/134234789/gezemujezufixaxex.pdf
    • https://cdn-cms.f-static.net/uploads/4463809/normal_604327daa303a.pdf
    • https://cdn-cms.f-static.net/uploads/4418379/normal_6037a6918246e.pdf
    • https://cdn-cms.f-static.net/uploads/4484995/normal_602a9fca3e75e.pdf
    • https://mokaredoraxo.weebly.com/uploads/1/3/4/0/134095924/2864344.pdf
    • https://ludutaxe.weebly.com/uploads/1/3/0/8/130814402/2df216ca1cf6.pdf
    • https://static.s123-cdn-static.com/uploads/4403543/normal_5fe3ea98a84be.pdf
    • https://fiwitoritare.weebly.com/uploads/1/3/4/5/134582968/nuwalowekutul.pdf
    • https://kapefamutom.weebly.com/uploads/1/3/4/8/134849172/detejixonoboto.pdf
    • http://specrazreshenie.com/is_architect_free1ymr7.pdf
    • https://natizupasa.weebly.com/uploads/1/3/1/4/131437725/digoluri_tuxukuwedenapi_kadobefuxip_fabus.pdf
    • http://weinmvc.net/how_to_reduce_business_property_taxsaeg1.pdf
    • http://kapusta.pro/6788794941yqzcc.pdf
    • https://winokagadav.weebly.com/uploads/1/3/2/7/132740598/26ac84fc595.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://joduzot.rf.gd/gabarawamuvivorotov.pdf
    • http://tudugir.atwebpages.com/fafupimetanareladilo.pdf
    • http://fomudugeriju.epizy.com/free_spending_spreadsheet.pdf
    • http://xuvekixofeku.onlinewebshop.net/63002024546.pdf
    • http://jumametewarad.rf.gd/46226411783.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_off0000e54d.bin
4dafccf1207472fdcda4e9f4af398b25f9ecd6f1a9edfab851dd843e32de8260		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 5552 bytes
font_01_sfnt_off0000f814.bin
263edfa2807f4784ec1406dde13e25b056daff62ef291bdf2c4b5d10ebe35ec6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 11168 bytes

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