Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfabb7d205d8110f…

MALICIOUS

PDF

81.9 KB Created: 2021-02-22 22:58:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4301d3c07713d30d29555a85e0531f2f SHA-1: 94af4c220a05eec259b88231cc6d5ae12d9eb17b SHA-256: bfabb7d205d8110fc836fb8d6891d521d29c73cc521c613751c5bc7ee55796dd
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are on disposable hosting and utilize UTM parameters, indicating a phishing or spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious websites for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure itself is indicative of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/strik?utm_term=average+salary+for+graphic+designer+in+chicago PDF link annotation
    • http://thesimplycompleteseries.com/storyboard_software_free_download_macfzie0.pdfIn PDF document text
    • https://cdn.sqhk.co/gixelotopa/fhginfW/copenhagen_grooming_beard_growth_kit_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/mivesumor/dicijhH/33631481450.pdfIn PDF document text
    • https://cdn.sqhk.co/zapajugadira/adTHaha/lujabemidakavaxuxop.pdfIn PDF document text
    • http://osthondroz.com/chahun_main_ya_na_female_song4dfeu.pdfIn PDF document text
    • https://cdn.sqhk.co/mopijiluxu/jeU9Ghd/switch_pro_controller_charging_indicator.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/chb7ZhM/nawolabeborugipe.pdfIn PDF document text
    • https://cdn.sqhk.co/risejesob/cibibib/xamab.pdfIn PDF document text
    • http://hermidkovo.info/24605718491fb0rc.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuniruf/gzwCifw/27932115823.pdfIn PDF document text
    • https://cdn.sqhk.co/lanumakefu/DegccNE/65206134444.pdfIn PDF document text
    • http://cyberlife.store/how_to_plant_red_romaine_lettucemouku.pdfIn PDF document text
    • http://reduslim-eu.site/japesogefavdci2.pdfIn PDF document text
    • http://atomlinux.com/teduxufudifoji5j537.pdfIn PDF document text
    • http://olivamebel.com/how_to_fix_turbo_brush_bissellwi8xl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469617/normal_601b43469f90c.pdfIn PDF document text
    • http://artrosil.xyz/happy_new_year_abba_video_freem938h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pejasevolebik.rf.gd/79491147180.pdfIn PDF document text
    • http://nelibusanexiput.epizy.com/zesofesagowug.pdfIn PDF document text
    • http://bobesesoja.epizy.com/2810603795.pdfIn PDF document text
    • http://tutopuwozel.epizy.com/springboard_algebra_2_book_answers.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_off00010123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10123 5568 bytes
SHA-256: 7f2757fa913beca75294989735a60c976e123cb5140cbb8c96f987df8a667ffe
font_01_sfnt_off0001141f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1141F 11228 bytes
SHA-256: 7d9294a7b5022826d185014d125e2f2374ee6efbf23229f3f3ce42f3170d7ffc

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