Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef7498930a240ff…

MALICIOUS

PDF

86.3 KB Created: 2021-03-18 05:00:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c747a8e99f3936c5c8f6bbcfb71133f2 SHA-1: d225a897b39825ffbdeef0e1e3234c60ce94deb6 SHA-256: 2ef7498930a240ffc273cf235a5ef823ec6427d6111de714cbc3dc6cb3ace817
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs, such as 'https://zajinet.ru/strik?utm_term=altec+lansing+waterproof+bluetooth+speaker+pairing', likely serve as lures to malicious or phishing sites. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://zajinet.ru/strik?utm_term=altec+lansing+waterproof+bluetooth+speaker+pairing PDF link annotation
    • https://cdn.sqhk.co/taguvomir/ajeoahd/aritmetik_dizi_formlleri_11._snf.pdfIn PDF document text
    • https://wegedojilo.weebly.com/uploads/1/3/1/3/131398291/zowakawumogelavab.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/W2hfgjE/97636495058.pdfIn PDF document text
    • https://cdn.sqhk.co/busibelifiv/sihhjij/82030733091.pdfIn PDF document text
    • https://cdn.sqhk.co/nizekidido/eijxjag/92437147878.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/zgbidhd/49846680016.pdfIn PDF document text
    • https://sokifaxus.weebly.com/uploads/1/3/4/6/134666683/tugekojexebebib.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/2iiZKjc/7186486950.pdfIn PDF document text
    • https://xajifopuref.weebly.com/uploads/1/3/3/9/133999146/1166254.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421352/normal_600e9dd453858.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465688/normal_60374664c4460.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/gdgg5y0/adidas_zx_runner_4d_light_aqua.pdfIn PDF document text
    • https://kitawusew.weebly.com/uploads/1/3/4/2/134234725/b38b39c8ee3fd.pdfIn PDF document text
    • http://gagitevanonuti.mywebcommunity.org/7098166225.pdfIn PDF document text
    • https://vetinuvejozijuk.weebly.com/uploads/1/3/4/7/134745319/f41102c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413862/normal_5ffab4da56da8.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/PiikqVA/literacy_play_center_ideas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452861/normal_5fe8db1f68cb6.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/cgebVpa/gmail_messages_disappeared.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lutepotazor.onlinewebshop.net/quantitative_equity_portfolio_management_modern_techniques_and_applications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03d0b63f-832f-46d7-b639-3ccdd9eb80b3/excel_vba_find_file_wildcard.pdfIn PDF document text
    • http://jajogagek.atwebpages.com/mergers_and_acquisitions_playbook_lessons_from_the_middle_market_trenches.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48ec9436-74a8-463b-ac99-340d74b51c89/subarutulor.pdfIn PDF document text
    • http://zonafikepejese.onlinewebshop.net/kijopa.pdfIn PDF document text
    • http://felugibesixe.onlinewebshop.net/remijebofisu.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_off00011357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11357 5564 bytes
SHA-256: bdf08f795e1754de31ffffca2b9daf26555731d92e0284c5e415ee192d0b75a9
font_01_sfnt_off0001264b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264B 10936 bytes
SHA-256: ace5d14cd309dad90385c3da040e908880584d452a75a1270b9322d66c6c6ea6