Malicious PDF — malware analysis report

Static analysis result for SHA-256 d493f46491ded15c…

MALICIOUS

PDF

77.0 KB Created: 2021-03-17 11:44:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6a1e3f83c2a0eb6ba4fd9a509da861ca SHA-1: 2a77f850139664b495f0ef451788de4faab6325a SHA-256: d493f46491ded15c01c7d590b22f21c9691cb60d7e0e7ea0ba52e34ec689a90b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 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://maypoin.ru/strik?utm_term=what+makes+a+viking+a+viking PDF link annotation
    • https://cdn.sqhk.co/zejizoguzut/iIGEggj/jelly_shape_shift_jelly_fit_cube_shifter.pdfIn PDF document text
    • https://zixokamewi.weebly.com/uploads/1/3/4/3/134386319/8052524.pdfIn PDF document text
    • https://cdn.sqhk.co/wipedekis/e5aAcJc/disaster_will_strike_2_38.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/n0PNgeE/superbike_rider_quotes.pdfIn PDF document text
    • https://lawejuja.weebly.com/uploads/1/3/0/7/130740077/6804714.pdfIn PDF document text
    • http://raxawevamavox.getenjoyment.net/are_delonghi_and_krups_the_same_company.pdfIn PDF document text
    • http://xalenupom.getenjoyment.net/donokolofisabudusib.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/a40a9eef-5386-4f87-8269-6cb638040bc6/does_hobby_lobby_have_paint_by_numbers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08b13197-a2ea-44a6-a480-721db57a91e3/rutepe.pdfIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_a9d2b275811a4780af0e31397f8f6a5c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/262365f7-c1f1-4655-a241-9303242d812d/9194305125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d9441f3-3f21-4c57-9428-347cdabb1cce/87459201965.pdfIn PDF document text
    • https://cb0508fd-2a1f-4901-a161-a76823ee8e4f.filesusr.com/ugd/52013e_459d007cef134eb8962fef6b44b40cba.pdf?index=trueIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_f1b21770fbd4439987fe80b3752aff03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/368e2421-419d-4fb1-be3a-231727b59aba/cuando_termina_cien_aos_de_soledad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a456d17b-4e58-4c2e-a203-c758c1ec86ce/zumebipimetimilubefidasol.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_off0000eef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF5 5108 bytes
SHA-256: 7184e3cc05390ace375e60542cd2385a97ab2f803e0708ce3ddd127e85b776d5
font_01_sfnt_off00010043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10043 11548 bytes
SHA-256: 71c95f923ee166aebb31dcc2b06c386374c75e4af407de1b96bf8f17970b3a33

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