Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07589d1bd32ed37…

MALICIOUS

PDF

91.4 KB Created: 2021-03-27 10:26:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e63c058979282be892cc120c7783d4f2 SHA-1: d2475bfabd76fd67e00e428dcc79837f7c41ba0f SHA-256: a07589d1bd32ed3744d63a4676b33d16b61d7c61ea19672ff2bcac6ea5e688e3
186 Risk Score

Malware Insights

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

The PDF document contains numerous external links, flagged as a link farm, with a primary URL pointing to 'mezovuduw.ru'. This heuristic, combined with ML classification and ClamAV detection, strongly indicates malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the redirection to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/123?utm_term=lgps+actuarial+valuation+report PDF link annotation
    • https://lurenosofen.weebly.com/uploads/1/3/0/7/130740325/jibiguzunulavowap.pdfIn PDF document text
    • https://cdn.sqhk.co/lowanivari/jarhejg/7984911630.pdfIn PDF document text
    • https://cdn.sqhk.co/tedefoso/Jgcifgi/17264474893.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/dxEhcjd/xarojumomodowotekamolux.pdfIn PDF document text
    • https://tanafojapazikop.weebly.com/uploads/1/3/4/5/134576724/dejepupixid_pezosodezoz_jusezukivufise.pdfIn PDF document text
    • https://rajexomogalifi.weebly.com/uploads/1/3/4/8/134891851/zorotunesarop-pimamisifa-gizaw-buzal.pdfIn PDF document text
    • https://cdn.sqhk.co/tibapopedeka/3FF99jc/disable_lock_screen_windows_10_domain.pdfIn PDF document text
    • https://cdn.sqhk.co/gujurolekuma/mgdVgdT/fimikolofulatirosovubip.pdfIn PDF document text
    • https://lemorixumo.weebly.com/uploads/1/3/4/7/134748879/676a13a04ce85.pdfIn PDF document text
    • https://pigabatanez.weebly.com/uploads/1/3/1/3/131380253/pavogaku-lalamimasu.pdfIn PDF document text
    • http://rodufedizukol.22web.org/fegefefuregexa.pdfIn PDF document text
    • https://cdn.sqhk.co/rejiwosujupa/jgsw8ig/declarations_of_war_ww1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_4d30dcc1e3bd43d2b13f7c2acdd0a1f5.pdf?index=trueIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_3374942b5b1e4e998b8e0bfd2ad77ec7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/acb95a4b-2e4a-49e9-bada-680a81355e38/how_to_use_google_workspace.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a09a2e9c-e1d3-438c-8d9a-0bf728a89806/what_is_the_omnibus_reconciliation_act_of_1987.pdfIn PDF document text
    • http://fetelezazojidi.rf.gd/bloomberg_barclays_global_aggregate_index.pdfIn PDF document text
    • https://8aefc570-8454-48c3-bb63-d4d1067b7ce0.filesusr.com/ugd/5c9621_2d3f3bbcf27d4a4aace46205cec3e64d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/38a75f63-9b6c-42a3-8fb7-68e3193a9c7d/89039757217.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5bdae49-cef9-4844-a732-1b4b7b49cf27/cleaning_cuisinart_k_cup_coffee_maker.pdfIn PDF document text
    • https://c6b89c2f-dc7d-490d-a648-077c51828da9.filesusr.com/ugd/29ab01_e46e50cd917a465692f249c42600525c.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_off00012748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12748 5104 bytes
SHA-256: 528a1a9f80f72c50c85b0b91827f3bd147a0ef1b1025205318bd298ce9d80aac
font_01_sfnt_off000138c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138C8 11016 bytes
SHA-256: 70d2e628e194eac6598707f4b8f8d3ecc484cfff2ba63c44b834d74b99105316