Malicious PDF — malware analysis report

Static analysis result for SHA-256 8420981de2e6d2ff…

MALICIOUS

PDF

73.9 KB Created: 2021-03-10 21:48:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a589737fc6bfce460534f4c59092bcc6 SHA-1: 5b6cf6e7c581a8821385e60ca03c06945881add0 SHA-256: 8420981de2e6d2ff5fec8f307d93410771238c8a78b501abe4acc0a2d6908e3a
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 0.9998

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://vilenefex.ru/123?utm_term=engineering+guide+fire+risk+assessment+pdf PDF link annotation
    • http://geosen.net/merivizewajumekkpg0.pdfIn PDF document text
    • http://prizinsta.site/770853871812vvvp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369640/normal_60008d9eec91d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481999/normal_5fe1969805791.pdfIn PDF document text
    • http://proita.fun/left_handed_bass_guitar_scaleskabns.pdfIn PDF document text
    • http://bobr.space/sat_writing_and_language_practice_test_1_answers8pfjg.pdfIn PDF document text
    • http://crubr.space/kufejudamniwi7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389793/normal_60338f7ee7b69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503197/normal_5ff30e095532c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383917/normal_6018ea3c992eb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wodedane.rf.gd/notice_of_removal_to_federal_court_form.pdfIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_0ea8df7a42d842a2955c7639fee35463.pdf?index=trueIn PDF document text
    • http://niginikixino.epizy.com/87175811623.pdfIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_cbb52d67964a4f2081dd046387a807ae.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_off0000e5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C2 5348 bytes
SHA-256: 11806177bafc82a1d5d2a09f8a5a1b02a0fcafffc797057f340c9520b5e1d743
font_01_sfnt_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 10136 bytes
SHA-256: eb8d57ba06aa3a4a5eb1d9097fe99e81a77eed46a70a6edb6ad822ec91d24e2f

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