Malicious PDF — malware analysis report

Static analysis result for SHA-256 33eae5a85b02e23d…

MALICIOUS

PDF

81.6 KB Created: 2021-05-11 16:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 684c64301fe800a11c462d91d3416f17 SHA-1: acea72ec2a8ddc6e788c86278d8a4d59f59f75ee SHA-256: 33eae5a85b02e23dcb62abbabdefab444fc4b8db571d8201942b097b12a2128e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/strik?utm_term=nancy+drew+recap+episode+6
    • http://xivobivivupe.mygamesonline.org/mathematical_reasoning_practice_test.pdf
    • https://cdn.sqhk.co/kuretunaba/uLhfAid/flight_release_date_alert.pdf
    • https://wovenatoz.weebly.com/uploads/1/3/1/4/131454427/2ceb963.pdf
    • https://dutariviwasupor.weebly.com/uploads/1/3/4/6/134610277/sowakowonijofovivowe.pdf
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/gomimi.pdf
    • https://cdn.sqhk.co/rivotoxupow/iIjjjjP/international_superstar_soccer_deluxe_snes_vs_genesis.pdf
    • https://jarurozo.weebly.com/uploads/1/3/5/3/135320013/5790318.pdf
    • https://saniluje.weebly.com/uploads/1/3/4/3/134323688/671fb0.pdf
    • https://givolejemaxo.weebly.com/uploads/1/3/5/3/135345859/roxipubivixaxudu.pdf
    • http://kadanijojabuf.mywebcommunity.org/59044286170.pdf
    • http://vevovifox.scienceontheweb.net/house_sale_agreement_format.pdf
    • http://morasuxod.getenjoyment.net/how_many_covid_cases_in_texas_right_now.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_e1fb010d846d4f979bc6f215fbf41f86.pdf?index=true
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_396558980e674c878794ae710bcc2e7e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/94951dd3-2f21-4a74-aa4f-4d603e0f8a7b/bulova_marine_star_automatic_review.pdf
    • https://uploads.strikinglycdn.com/files/f6c68c71-45d1-4a1b-a72c-24ff37aa3e29/pemewovajovemir.pdf
    • https://uploads.strikinglycdn.com/files/0cf39b6f-18bb-47d4-8c52-abdc886b73ef/mean_median_mode_range_standard_deviation_variance.pdf
    • https://933527c5-e005-4225-a3aa-05fee46c7696.filesusr.com/ugd/b51dd5_53f722bc314f4ea59117b1ae922d63b3.pdf?index=true
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_22aa0c2b41854206a69cc747e8f93a58.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f110.bin
5cfb7aca7de4a664c829c4a11cee308ce6ab9fe70e96e734b38c11700b1a680f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 5060 bytes
font_01_sfnt_off0001025b.bin
7aed0ecf70b161c31898432d3fae848229c3a2248ef17c1294bb8d7620f1dd00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1025B 11988 bytes
font_02_sfnt_off00012b3a.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3A 4324 bytes

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