Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba445b6696ad4c1d…

MALICIOUS

PDF

72.0 KB Created: 2021-03-17 00:21:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 99f1b460d8c61327ca181c891029a973 SHA-1: e8630ea79a6b8d981e01cea31a385cc9945a25a2 SHA-256: ba445b6696ad4c1d0b281a5e7efff1be8d5cb2cdd08167c4dd7f3d53e4641be8
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 0.9996

Heuristics 6

  • 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 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://jacksth.ru/123?utm_term=rival+stars+basketball+hack PDF link annotation
    • https://cdn.sqhk.co/niririga/jgyePMm/47120285781.pdfIn PDF document text
    • https://tulalesin.weebly.com/uploads/1/3/4/8/134876190/5fa1b94e6d9b.pdfIn PDF document text
    • https://risimapi.weebly.com/uploads/1/3/4/3/134321435/ac6b12b.pdfIn PDF document text
    • http://mikrotikwizard.com/muxaw9js3z.pdfIn PDF document text
    • https://givolejemaxo.weebly.com/uploads/1/3/5/3/135345859/xanovilakido.pdfIn PDF document text
    • http://aarbuz.space/930130374091rtrb.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/dodndhh/zulebesigaxanikegura.pdfIn PDF document text
    • https://jufozafofover.weebly.com/uploads/1/3/6/0/136050361/6842240.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/NggjjaW/bibibuvufa.pdfIn PDF document text
    • https://cdn.sqhk.co/besudamuge/gohekmQ/28798152579.pdfIn PDF document text
    • https://cdn.sqhk.co/videbamez/U1KHgiL/router_mobile_3g_r1000.pdfIn PDF document text
    • https://gilaxaled.weebly.com/uploads/1/3/1/4/131438091/fujixa-dixejojum-ladoxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdd249b8-77b1-4a94-b024-8995efe4d959.filesusr.com/ugd/d394ff_c0c4861e3bba430fad87199429a61ea3.pdf?index=trueIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_69c5d2afe51f47cbb4271b95faec8735.pdf?index=trueIn PDF document text
    • https://6e678f60-abc6-404c-883a-cd1729fdffee.filesusr.com/ugd/e4291f_4e648ca574474c00b4354e93b6da889c.pdf?index=trueIn PDF document text
    • https://3064a0a7-8496-4b95-be1e-56094aee372f.filesusr.com/ugd/0cf4b9_93cde654bd2041119a8ee26e8f4f6d4d.pdf?index=trueIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_4b147a6d2bb44777b425d144734622eb.pdf?index=trueIn PDF document text
    • https://08202b68-adf4-4b7d-bb06-fcebe54c78b8.filesusr.com/ugd/76dd3d_827a97764d894f13aeec7f01b48d1442.pdf?index=trueIn PDF document text
    • https://d2d87fd5-5f4d-49aa-ab3c-2263ce4b5d22.filesusr.com/ugd/9169d2_c5569c4274124fc9b664b043fca9bd98.pdf?index=trueIn PDF document text
    • https://0fecb50d-c8db-4b5c-a67e-01a13b1c0e9a.filesusr.com/ugd/da7c2d_74873de3011b4d9b9427d1d70a671c43.pdf?index=trueIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_b04abe7febb34e508f2e66ba22c806a1.pdf?index=trueIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_c9a2f29ad21a46ceb911925d1569bdf3.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_off0000db72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB72 5156 bytes
SHA-256: bb2714952aed16d62c7d7f461c6a4bc6978353d0c98b804c864de7637b045742
font_01_sfnt_off0000ed01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 11248 bytes
SHA-256: 66882f3ecc254c4207fb5b88d39e539d5fdd276bb30b6626e636709677dc6c28