PDF malware analysis — malicious · a975a861904e28c3

MALICIOUS

PDF

83.4 KB Created: 2021-03-25 09:03:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10

MD5: ee81a6b0af0c60ec3a2a8ffdc04e5d9d SHA-1: a30fb6069278d01ca373826c6171c222027dbad0 SHA-256: a975a861904e28c3155efa7986223b0508c2783716c6f634aa831eec7177e71c

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to serve as a lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

Heuristics 5

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 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://botokaw.ru/award?keyword=a+letter+to+garcia+pdf PDF link annotation
- http://zofiziz.getenjoyment.net/56557229060.pdfIn PDF document text
- https://mopebewugo.weebly.com/uploads/1/3/0/7/130776026/4943261.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4491925/normal_5ff97aa91ae79.pdfIn PDF document text
- http://pikejofopon.mypressonline.com/52223680416.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4393925/normal_603edfbf04cb0.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4421778/normal_5fcdc34957b3b.pdfIn PDF document text
- https://luragelekow.weebly.com/uploads/1/3/4/3/134377287/lawapuvu.pdfIn PDF document text
- https://musimisipamorek.weebly.com/uploads/1/3/4/5/134594646/9e1de1654ed33a.pdfIn PDF document text
- http://bidimiw.sportsontheweb.net/vamebezeg.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4485176/normal_600b13cf45af7.pdfIn PDF document text
- http://igme.site/951766688573q55q.pdfIn PDF document text
- http://vikiduxa.mywebcommunity.org/8295413863.pdfIn PDF document text
- http://copyright-services-us.com/zabukiwojugia4tuc.pdfIn PDF document text
- https://fubuzupa.weebly.com/uploads/1/3/5/3/135324320/wojetaminab.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4465142/normal_603ec9996b3a0.pdfIn PDF document text
- http://cparta.moscow/stranded_deep_32_bits_2018o02a0.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://uploads.strikinglycdn.com/files/40be985a-af2e-458c-bb5e-99bc6e779656/what_is_the_integral_of_cos_squared_x.pdfIn PDF document text
- https://ef90beaa-bca2-431e-862c-49c19dd94618.filesusr.com/ugd/06497e_2d22ca0f5aa2448e922804344d5db845.pdf?index=trueIn PDF document text
- http://movuzawizigevej.myartsonline.com/english_subject_verb_agreement_rules.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/6d80b810-ea2e-4dfd-9dbc-53d83d515a93/how_much_is_a_2015_chevy_cruze_worth.pdfIn PDF document text
- https://4b4ea461-5266-411b-8735-d5290551f550.filesusr.com/ugd/7fedcf_96022250dc7649cea80a7ece4d00b466.pdf?index=trueIn PDF document text
- https://bb74f61c-7045-47bf-9a7e-968101ee373e.filesusr.com/ugd/81ef4b_a83e5ef0f5824f139f1947f14afe396f.pdf?index=trueIn PDF document text
- https://3926d074-74ab-41cc-aa9d-340192ccda4e.filesusr.com/ugd/5619e7_67c62b52a13945b8a65fe158def05c8a.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fb8e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB8E	4816 bytes
SHA-256: `24b9ef03737611b53ff6975660f17daf4a88a38e0dd626a3c7df64a799a21d9c`
`font_01_sfnt_off00010c07.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10C07	11164 bytes
SHA-256: `e66bd5c685afc0db252f7a733b2ee24bd70bb82f217264f8232fded6f5a208ff`
`font_02_sfnt_off0001326b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1326B	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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