Malicious PDF — malware analysis report

Static analysis result for SHA-256 70434d4928c30c84…

MALICIOUS

PDF

78.6 KB Created: 2021-04-01 14:01:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 718a7e6076cb2918e60eb451af714268 SHA-1: 16e811291f1cbcd9be0c434d4f6218172dd4d338 SHA-256: 70434d4928c30c8482449941f4724e58a876c05325fbd33e3e2c7054166cc243
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wix?keyword=chamberlain+power+drive+pd212d+manual+espa%25C3%25B1ol PDF link annotation
    • https://cdn.sqhk.co/tivinarafuvu/hielAWB/ruvovusipivug.pdfIn PDF document text
    • https://cdn.sqhk.co/puwupasakej/gjcjjhi/20401559473.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/CtgeAkE/xujugu.pdfIn PDF document text
    • https://cdn.sqhk.co/semiwewedazi/2lNnNgi/60367046222.pdfIn PDF document text
    • https://cdn.sqhk.co/vozeseseber/chhjj2T/launchpad_alan_walker_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/welosezu/aQjBjhk/62787945095.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/gjeoLt2/mokejoromovunozaxe.pdfIn PDF document text
    • https://cdn.sqhk.co/zutigaku/Gsggddx/xisudesejus.pdfIn PDF document text
    • http://smartline58.ru/retovawv5gd0.pdfIn PDF document text
    • http://motivawka.online/acts_praying_acronym3ef39.pdfIn PDF document text
    • https://cdn.sqhk.co/gugosobor/UuuVhhZ/chore_list_for_11_year_old_boy.pdfIn PDF document text
    • http://dkmz3.club/mini_aussies_with_tails_for_sale9d6qp.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/686186467250q4gk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/donake/94094118100.pdfIn PDF document text
    • http://noroxijarajumez.epizy.com/chromebook_update_android_apps.pdfIn PDF document text
    • http://romisov.epizy.com/runepenavulapus.pdfIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_1a7bad3532154e7eacc8de43374416ce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/niporofez/60140135852.pdfIn PDF document text
    • https://e8ceee85-86bf-4804-80ab-d7a1511cbcf5.filesusr.com/ugd/38650a_64b42adb5e3c4e168769ac77e3fa733e.pdf?index=trueIn PDF document text
    • https://efe523a3-d756-4f55-ba91-412f3a718e00.filesusr.com/ugd/236571_a1b8eb7643de476dbb9159ef4bb01f25.pdf?index=trueIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_bcd7a98ba92e4bd3bad0837074f6465a.pdf?index=trueIn 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_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 5792 bytes
SHA-256: 90e2810d04b5734098838e882ece475caf76ec0c61f387b7037c64fa1ea9449b
font_01_sfnt_off0001056b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056B 10996 bytes
SHA-256: 75228c2eeff298c0d0cd96144f32aeef87490ed2154a6598ebd1a3b62e562ff2

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