Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42ada17aec518eb…

MALICIOUS

PDF

78.5 KB Created: 2021-04-24 07:07:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4c4b531f411700da105beed20d2f47dc SHA-1: 94b9418f111253fed2c1557f467c5a6c36d96ce6 SHA-256: f42ada17aec518eb8f77ad72be7215a0e1bd72cb5ec148f49111b797cbc1743f
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 hosting services, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of external URIs and the link farm heuristic point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://lozipotod.ru/strik?utm_term=schwinn+stationary+bike+seat+adjustment PDF link annotation
    • https://gosasaweju.weebly.com/uploads/1/3/1/3/131384289/wafirelifejik.pdfIn PDF document text
    • https://jebovemedafo.weebly.com/uploads/1/3/0/8/130813903/4295289.pdfIn PDF document text
    • http://hhizmet.com/48310343842dw0te.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373239/normal_604fb50a1b0b2.pdfIn PDF document text
    • https://xedasijaw.weebly.com/uploads/1/3/1/4/131453620/sipojal-pafir.pdfIn PDF document text
    • https://xagomutub.weebly.com/uploads/1/3/4/3/134321984/gupeni_dogalagibu.pdfIn PDF document text
    • http://zekaxezixil.medianewsonline.com/9066694892.pdfIn PDF document text
    • http://korsabarca.com/beat_mp3_rhythm_game_mod_apkht2gi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414871/normal_6054da30b8478.pdfIn PDF document text
    • http://bratskpravojur.ru/microsoft_office_2013_free_download_full_version_for_windows_8_cracked3z624.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/27937621251x3yom.pdfIn PDF document text
    • http://vobafoselalulor.mypressonline.com/zirotujajipigikaxolarez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482648/normal_6034ee5e5429f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387709/normal_5fd2012f747b2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a82939f2-44c0-4b16-b1bd-049520431510/python_setup.py_install_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/948c4a20-17a4-4eb0-9f30-1ee301056053/jozolonolufakexiriwemipak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fdc37022-e33b-4e74-9c6c-bb4cef27572e/47354198824.pdfIn PDF document text
    • https://f7cac2f2-528f-490f-9bef-cb2448a877de.filesusr.com/ugd/529ba0_4fc8e56da49d45d59d8f45c5f2383ca9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/40c136c6-2354-4ab3-b014-ac531656b7e1/house_on_a_hill_lyrics_amanda_cook_chords.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_cd87bd2984c14e4daede21e32128dd7c.pdf?index=trueIn PDF document text
    • http://kikanelomer.onlinewebshop.net/44106999591.pdfIn PDF document text
    • http://zegetafirotazaz.atwebpages.com/rexaruxoxovuzubosum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd34f819-c35e-4cfb-acdd-ac6426b23367/what_is_the_handmaids_tale_summary.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_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 5724 bytes
SHA-256: 2cec1f5f3c7c890dfd443b1da77b7e342754d8a2299fffa93ac21d6f46bc9141
font_01_sfnt_off00010825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10825 10460 bytes
SHA-256: de9179511ff0be5a1a70bd7eb57e9194f7619074830d2d4802965c51b9766c35