Malicious PDF — malware analysis report

Static analysis result for SHA-256 dff2c20d9053f538…

MALICIOUS

PDF

79.3 KB Created: 2021-04-11 06:01:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: eaf455b55804f28dcbf56a7b0f13bef8 SHA-1: dc5dda538bb4a8719d427600d97521f87d8ca854 SHA-256: dff2c20d9053f538366bd41e867511f75d0016bc9c9973c25dbedf82eff94782
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 identified as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://mezovuduw.ru/strik?utm_term=amazon.ca+vanity+fair+bras PDF link annotation
    • http://cocobuka3.xyz/where_can_i_learn_graphic_design_onlinezce0c.pdfIn PDF document text
    • http://life50it.pro/fmla_guidelines_for_paternity_leavex7m5r.pdfIn PDF document text
    • http://fujedavas.iblogger.org/economics_today_the_macro_view_fourth_custom_edition.pdfIn PDF document text
    • http://nalapagized.22web.org/segulugisewojogoxi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425501/normal_5ffeb1b7bedec.pdfIn PDF document text
    • http://formblckr1.xyz/rimedmx9fy.pdfIn PDF document text
    • http://lomidal.mygamesonline.org/79664267200.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383924/normal_5ffd54a0634bd.pdfIn PDF document text
    • https://sejumajofejopib.weebly.com/uploads/1/3/2/7/132740214/wuvejododafefegozive.pdfIn PDF document text
    • http://pifowovumuwe.medianewsonline.com/59139495293.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391013/normal_5ffcff1a6cdf7.pdfIn PDF document text
    • http://gufurebu.medianewsonline.com/7-day_flat-belly_tea_cleanse_meal_plan.pdfIn PDF document text
    • https://zeberafuduzugag.weebly.com/uploads/1/3/2/6/132682167/jowojowadogu.pdfIn PDF document text
    • https://mujunuduxur.weebly.com/uploads/1/3/5/3/135327440/6943233.pdfIn PDF document text
    • http://rankingcoach-seo.com/oxford_history_of_ancient_egypt8jxdk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gogujigasad.onlinewebshop.net/julian_date_calendar_2020.pdfIn PDF document text
    • http://kizosit.rf.gd/bloody_keyboard_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gusule/how_to_pick_leaf_lettuce_so_it_keeps_growing.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/93571667104.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/pifag.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/angelcare_ac401_alarm.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/gurob.pdfIn PDF document text
    • http://gupiwozekozib.rf.gd/98588796234.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_off0000f968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 5368 bytes
SHA-256: 9ee22c7d954d278250edf15383f9e56584660d373a10323d2037acbae2a0c2ea
font_01_sfnt_off00010bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB1 10740 bytes
SHA-256: 2e36101de4b23b021250efcbff21d9ed84a3442dbfdabc35215b19eb3e04cbfb

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