Malicious PDF — malware analysis report

Static analysis result for SHA-256 88bc78f90383028d…

MALICIOUS

PDF

81.7 KB Created: 2021-03-14 16:13:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 435a89a74e5eb8a6fbc9c9af5e5c6f0a SHA-1: 103f3d12953b9ebe98e8db3e8317a3ab8b69fede SHA-256: 88bc78f90383028dcc4aa74932def8a0d7c85b4be016bf57d84d0bc95ae5e866
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9994

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://druttle.ru/strik?utm_term=munchkin+card+game+rules PDF link annotation
    • http://hookup668.site/nrc_family_tree_form_download2bxra.pdfIn PDF document text
    • http://obuv-kozha.ru/how_to_buy_star_citizen_ships4idch.pdfIn PDF document text
    • http://kafikiwamavo.22web.org/wevifokusebopote.pdfIn PDF document text
    • http://kotowis.22web.org/android_version_for_samsung_note_5.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/3e87688d-4398-4b65-9099-efd7558c8bd5/gukosadebozitovege.pdfIn PDF document text
    • https://584abdf6-e408-48d3-a53c-4313a8f82471.filesusr.com/ugd/18ee90_c71ca9d6fb63448ebc5d100ffed97617.pdf?index=trueIn PDF document text
    • http://goxaronone.epizy.com/27120477901.pdfIn PDF document text
    • http://bixuxopot.epizy.com/gagebum.pdfIn PDF document text
    • http://torumaxot.rf.gd/ek_baar_song_vvr.pdfIn PDF document text
    • https://a1bd7baf-2de3-4c81-8914-4b74a732ecf9.filesusr.com/ugd/c89f15_d2aafc5cc0f5479cbb974fe2e5c1d378.pdf?index=trueIn PDF document text
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_fb6b17b35c3948f28d7bf5b0b703f410.pdf?index=trueIn PDF document text
    • https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_36e21f074b8a40a986c201029bdd83ba.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6ecad79-7981-44bd-aefb-c2746ae4c6a7/29217846210.pdfIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_64e6a81e30e442d19ba4ff6e6429b557.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/425ccfe9-3827-42b3-9c31-3804e94cec99/pigivurorajulonodewig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a1f8951-918c-402b-a9fd-13e47b726414/47351772198.pdfIn PDF document text
    • http://navilifujux.rf.gd/how_long_does_it_take_to_write_morning_pages.pdfIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_e8dd183a4e9d47b296ead0e62a39f2f0.pdf?index=trueIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_d0eef359fbcc4e9b80ae38f275f018b5.pdf?index=trueIn PDF document text
    • http://janevowox.epizy.com/xasosotakam.pdfIn PDF document text
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_55f31569f1124e9a9ee0f282b761d0af.pdf?index=trueIn PDF document text
    • http://zebinopo.epizy.com/mai_teri_chunariya_lehrayi_best_dance_performance.pdfIn PDF document text
    • https://176fe727-baa2-4f6f-8ab0-cddcd97ecb74.filesusr.com/ugd/45df28_4b75e5c7f3bc47a39b7563b4521fc5a3.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_off00010187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10187 5424 bytes
SHA-256: 7f64c8bd23ef57b191b7a76f2af296306a07e197672bc72af9ce5cc58776f057
font_01_sfnt_off000113d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D8 10628 bytes
SHA-256: 94ee7a53ce37cd7f8a1daa0b687f019d6c14977fc0501ea02db7bbd3d9dd60e8

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