Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d0608d9a6edc999…

MALICIOUS

PDF

74.6 KB Created: 2021-05-06 18:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 66eb16373b78aa644bce66031f3dc123 SHA-1: 8ec2e654f6084c218228611e8362b955ae8a8f16 SHA-256: 2d0608d9a6edc9990448ea2fbe7f2fcf842e4e0f33af614ebcf0961cce459544
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a significant number of external links, indicating a link farm designed to direct users to various websites. The presence of multiple disposable hosting domains and UTM parameters suggests a malicious intent, likely for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=are+chromebooks+worth+buying PDF link annotation
    • http://biwonomapul.iblogger.org/skf_needle_roller_bearing.pdfIn PDF document text
    • http://xevokegejir.iblogger.org/axios_react_native_formdata.pdfIn PDF document text
    • http://vizezokope.iblogger.org/brevet_franais_2020_corrig.pdfIn PDF document text
    • http://verokunutez.22web.org/plc_programming_software_allen_bradley.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xatosizukav.epizy.com/40169217221.pdfIn PDF document text
    • http://nogosos.epizy.com/70188430737.pdfIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_f21ab1b5ad7341d19caefb2aff01e987.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/94903767-29a8-456e-bdf6-922ea0c91157/trane_cleaneffects_filter_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/054fe8b9-7553-405f-a1c1-fe3b4d61e39d/wafedofaxubeterun.pdfIn PDF document text
    • https://4edd92ed-4e96-4c3d-a837-a16c7246ae9e.filesusr.com/ugd/7c3149_26d98293430044799d69c793f5a29c11.pdf?index=trueIn PDF document text
    • http://wolaniloko.epizy.com/gavibabasujane.pdfIn PDF document text
    • http://weboxezave.epizy.com/sumiwarenatulatuj.pdfIn PDF document text
    • http://pidosowot.epizy.com/doodle_god_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5167c148-eecc-476e-a791-7359b87ed5ac/why_wont_my_bissell_vacuum_not_suctioning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8937f6b-ca5a-4ec1-9e37-50b1d1e4a17b/12280859782.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4e39fab-7caa-4741-b961-736853bd67e7/12929334062.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_off0000e5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C1 5360 bytes
SHA-256: 7261e6a978cdf76b0d66bc803bc0357386ce89fbf0e1a9952ed8c91817cf5f1c
font_01_sfnt_off0000f7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EF 11172 bytes
SHA-256: da8bce57f010d79d00fa2e31acfc2dc362120ae1471a57e047333dd960ac7370

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