Malicious PDF — malware analysis report

Static analysis result for SHA-256 b18370ec6c57b65e…

MALICIOUS

PDF

70.9 KB Created: 2021-03-21 04:23:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 8b2f55e04acdedfebd6510d9780a5ea7 SHA-1: c8b3616d885c351bd0744343ff4315a81518576e SHA-256: b18370ec6c57b65ef56e3e6c76f8a75d92c8e9ea55d065372474f517cd8f92ea
186 Risk Score

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 0.9993

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://lozipotod.ru/award?keyword=encyclopedia+of+general+knowledge+2020+pdf PDF link annotation
    • http://alkostore.xyz/triton_ii_sand_filter_drain_plugf8d0r.pdfIn PDF document text
    • http://tiwelonepozafuw.iblogger.org/zimenimazesita.pdfIn PDF document text
    • http://front-glass.space/ripafafbfi59.pdfIn PDF document text
    • http://constructionhouse.info/tumiwububonabaluputad7y7c1.pdfIn PDF document text
    • http://vobigivu.22web.org/kenmore_35_pint_dehumidifier_troubleshooting.pdfIn PDF document text
    • http://3gusevshop.space/15505576206jzdoy.pdfIn PDF document text
    • http://vvd.bar/juzozuwoney8p2f.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/eb4d860e-5425-45bc-92df-8427c242c98b/mipotonazewigu.pdfIn PDF document text
    • https://36071b1a-d853-4ad1-bccf-0ed894d94038.filesusr.com/ugd/906e9f_5c44094f69a1427cba8dc86491354c8b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4052dc2-fbcd-4ffa-9f3b-4d9bb3fdb0a7/70313306795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5fd107c1-e356-4756-86e6-d309a1dd90e5/41096545894.pdfIn PDF document text
    • http://mapexas.epizy.com/54580013526.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d76af170-c9ce-4e75-bd57-d43bad18f980/24492113283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b60c628-e288-40bc-a45e-a88e2f3df8d5/mozukolelolam.pdfIn PDF document text
    • https://e82ff0bd-cb1a-4782-8b92-0a0fb7657660.filesusr.com/ugd/d17951_2234bb8cc7be41e79c363b8a864bf68e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/36c3394f-5554-4435-977f-45c37a1abc1c/14599655626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85f3ecf1-f337-417e-9295-c1f63a2917f5/sapuzodumonegi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/484316b4-921a-4bdf-a626-1882caf22962/bexaxuwosiseje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47467a4e-7b62-4a6c-a688-9702a18606fe/how_to_use_qcy.pdfIn PDF document text
    • https://3c8197b3-f999-4f29-b3da-fbdfea3dbf34.filesusr.com/ugd/0047a4_fe8a41d35daf44fc9981e5a86218229b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b3c3730-b15a-4296-aaba-75cd51ea2adc/rumble_fish_sushi_montclair_menu.pdfIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_729efa459756487aaa1c1b4c119952f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7369b5c-2a1f-4b3a-b1ad-059994dc6e3e/1709333825.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_off0000d619.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD619 5632 bytes
SHA-256: 7c30293b6c56f5fcc41d84549f60d61e83cc5a13f496bf1dc9fcefdda19213fc
font_01_sfnt_off0000e985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE985 10772 bytes
SHA-256: 3f92ddf34c2a36b8592b7e267fdf4292ce4ea8fe6e98dfa40feb24d6f3e50a80