Malicious PDF — malware analysis report

Static analysis result for SHA-256 081b9efb0a5d42a5…

MALICIOUS

PDF

70.3 KB Created: 2021-03-05 18:31:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 11039d563b85eb911bec84dca9290158 SHA-1: 2bc0c43f5c913873cef1cf112609387f322b6b7a SHA-256: 081b9efb0a5d42a56230427bffab1e42d7d6fac44e6bc015d134ac06f7c0ef1d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to obscure the ultimate destination. Heuristics indicate it's a link farm and a phishing/trojan PDF. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/aws?utm_term=5e+character+sheet+builder PDF link annotation
    • http://gadatoreneperil.mygamesonline.org/alfreds_group_piano_for_adults_book_1.pdfIn PDF document text
    • https://cdn.sqhk.co/kojariwirip/jb0ehdm/12194983912.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/bS3vGii/39518613533.pdfIn PDF document text
    • http://julivojurukumu.sportsontheweb.net/how_to_sell_a_buy_call_option_on_robinhood.pdfIn PDF document text
    • http://gemaxumaweti.22web.org/ziruvovojobepugi.pdfIn PDF document text
    • http://junumidutuzakox.getenjoyment.net/how_to_set_tax_on_casio_ms-80b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://muluwokixo.onlinewebshop.net/xesonenaru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/109680ec-2087-477e-925a-59614247653d/81981207362.pdfIn PDF document text
    • http://felubumasosazi.epizy.com/bournville_village_primary_school_uniform.pdfIn PDF document text
    • http://furaxem.rf.gd/rademagudilel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/783d3c7d-f990-4391-8d8c-9e0453732715/boxofelebatedepuguwim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5842421a-78b9-4c2a-9e30-aa1ceed018c7/wii_u_console_bundle_deals.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/77973399527.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeda41b2-8f0e-4772-b8d7-1a34ecd47f84/how_to_stick_vinyl_to_glass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6657b68-76a5-4e0d-9c65-57e78ae14bd7/48254510933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de64ea0e-600d-43bf-bc05-78b09d1a5e2d/dajurijutatik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dd862ec-0961-4f76-afd2-1e84b406dca2/tadatadejufa.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_off0000d695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD695 5196 bytes
SHA-256: c90c0bb3f039f7d44fb26316f66b5338e0795f37ecb5a928fe7d1a91798eef22
font_01_sfnt_off0000e834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE834 10620 bytes
SHA-256: 45c36163739c57a7207eac8976207d46cbb536e245fadbda07995b2ca98ceda0

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