Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2978ac68c16fcb8…

MALICIOUS

PDF

97.5 KB Created: 2021-03-01 08:51:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6ff1ce05cfc3065a334965ec3cc0fb20 SHA-1: 6537d1eea84ad7ed70d9c742922e8b07fb5603eb SHA-256: b2978ac68c16fcb8d6ffa83b1cc3d90ee97fce8fb08ca257b03898a73147c774
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to disposable domains and redirector services, indicating a link farm designed to distribute malicious content or phish users. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing or trojan variant. The presence of a link to a known malicious redirector further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=zagg+messenger+folio+manual+espa%25C3%25B1ol In PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_601786cb5925c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487626/normal_600063b242c13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420230/normal_5fd11a7261bdf.pdfIn PDF document text
    • http://kittyplay.online/347951008891rx7c.pdfIn PDF document text
    • http://pressit.fun/breach_of_contract_california_formsobqg.pdfIn PDF document text
    • https://sakolepak.weebly.com/uploads/1/3/4/5/134588428/sozazonazurukuzagoxo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412570/normal_5ffabe1ca3ec8.pdfIn PDF document text
    • http://boldly-grow.com/vegetacion_del_clima_polarprusq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413567/normal_5fe5517818a21.pdfIn PDF document text
    • http://joy-todays.online/solar_system_formation_the_planets_colorsxea13.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487647/normal_5fd0599484982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414153/normal_5fe8fc412e7a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377109/normal_603a202e3da5a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sulorowanutabu.atwebpages.com/what_concealed_meaning_does_the_poem_fire_and_ice_depict.pdfIn PDF document text
    • http://sijadogif.atwebpages.com/remington_pg6025_parts.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12135 5388 bytes
SHA-256: 6fff620e776f33b8341b75b499c536b2376fc7fb035d7ad4b13bfb8cd0d27152
font_01_sfnt_off0001333e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333E 14832 bytes
SHA-256: bf0afb0ec2613cc6170137d517a800cb1d09e5457eb62698180cc0ad2e196933
font_02_sfnt_off000161c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161C4 16108 bytes
SHA-256: 63d8d5eb8f8b5fe54746f6090e91a6110cca7e31017f08f100aa14b52b8aeed2

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