Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bf484309c7d329…

MALICIOUS

PDF

76.6 KB Created: 2021-03-08 08:59:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: a484a4f96b6b74826d9aa01aaee5beb8 SHA-1: 23895837249e3e08ae073e5b944c7f3f341bafe5 SHA-256: e8bf484309c7d32990f1c95355b73d60f8afe3baa796184c4b8fda183a8631ac
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of a large number of external links, including those on disposable hosting and with UTM parameters, strongly suggests a link farm or phishing campaign designed to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://botokaw.ru/strik?utm_term=the+old+republic+online+shops PDF link annotation
    • https://sabadefupi.weebly.com/uploads/1/3/4/3/134345863/jexunalutavin.pdfIn PDF document text
    • https://cdn.sqhk.co/dilobowuz/fhaESZY/best_cartoon_tv_app_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/xeduwukaxusa/qTUXghi/mifujuvaxufazisep.pdfIn PDF document text
    • http://reduslim-sito.site/pudofuduvevapivoxezoa5dio.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/gCjc8jg/tufee_school_and_coaching_management_apps.pdfIn PDF document text
    • http://about-central.com/jibazutiduxxzi3.pdfIn PDF document text
    • https://bagirarivevi.weebly.com/uploads/1/3/1/3/131384609/gufolixatewasilirude.pdfIn PDF document text
    • https://cdn.sqhk.co/lazuxorus/jafiggi/playstation_network_support_refund.pdfIn PDF document text
    • https://cdn.sqhk.co/felebamifuk/Agcgfj0/amazon_fresh_trial_code.pdfIn PDF document text
    • https://cdn.sqhk.co/sarimotel/WrjeQhb/bidenulorubovetupelizu.pdfIn PDF document text
    • http://robertferrell.net/jedir6uyqc.pdfIn PDF document text
    • http://icub.tech/1333778158k2h5q.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzutuse/biixgfo/towevuzujafaposive.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/serogajugomiji/shipping_container_house_floor_plans.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/urdu_handwriting_practice_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/zoxowekodexinorulu.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/nofitax.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/zamosejabin.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/53371450541.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AA 4844 bytes
SHA-256: ad15b73f39b947174f578961bae8465f31ba2310c516d52168fe26e5c3753513
font_01_sfnt_off0000f4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 9992 bytes
SHA-256: ff1288641e9999dbffbf86d7d592b1218905647ec69c8b7f21a42e79b8d16992
font_02_sfnt_off000116cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CC 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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