PDF malware analysis — malicious · 6bc463096e4f5518

MALICIOUS

PDF

78.5 KB Created: 2021-03-20 03:46:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02

MD5: 3fc026540669a82da231a51b48c46817 SHA-1: c052d6b850f1261694cd519fb8d25f78c9490624 SHA-256: 6bc463096e4f551841a425feca99398fbacd79bcaee689865a2dd000ec02633a

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, identified as a link farm, with one prominent URL pointing to a 'kitchen tools worksheet' which is likely a lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO manipulation. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=kitchen+tools+worksheet PDF link annotation
- https://cdn-cms.f-static.net/uploads/4403283/normal_604ccbaf2cc72.pdfIn PDF document text
- https://cdn.sqhk.co/wuxofepure/4hh83gg/92164505647.pdfIn PDF document text
- https://cdn.sqhk.co/movumatoz/2sihrjf/gibepekawetexavulisanopa.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4416514/normal_6043ef3ce63c3.pdfIn PDF document text
- http://fruits-summer.fun/43151763690jk9c2.pdfIn PDF document text
- http://startask.ru/creature_of_fenkenstrain_guide_osrsidu6i.pdfIn PDF document text
- https://cdn.sqhk.co/sivojadirabe/PEijhax/asteroids_coming_to_earth_2020.pdfIn PDF document text
- https://cdn.sqhk.co/rinilafexowi/Zhcjbhe/microsoft_teams_for_mac.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://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_46cff5c0227c40ba8bcf88c9db014f78.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/cf3ae7b1-46f7-4cbc-a6e8-605af167b254/peterbilt_diesel_technician_salary.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1f6a90bf-1cdf-4393-bccc-1e78232b7cf6/tixegizedorunurutakex.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/dd70d9e3-5272-49f9-bfb1-004235bcca05/58900896960.pdfIn PDF document text
- https://a765b249-d442-4b07-8ea9-8318d996b894.filesusr.com/ugd/902d29_bf7370012ecf4644853f12824da7087f.pdf?index=trueIn PDF document text
- https://91953a53-6f32-4f2a-9b2e-0f954541ff31.filesusr.com/ugd/dad90e_774d95bd778c43c799267c73cbcc1119.pdf?index=trueIn PDF document text
- https://6346cca1-8be9-442e-91e0-e35201572fa6.filesusr.com/ugd/a8c077_a6520be212364ca59910b18504599b1a.pdf?index=trueIn PDF document text
- https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_6f0f99a8f2dd4cd2987733381a1bce14.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/deaff4df-f5c1-4640-8ef5-cceea42a6d19/68938381218.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e8da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE8DA	4588 bytes
SHA-256: `e430e4e6aa4a093e5b15ed97f1ce820dbff4a1d410b8efd4db8d7cd9dd9d8e19`
`font_01_sfnt_off0000f862.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF862	10812 bytes
SHA-256: `d9c9b447aceb56726f0189022ef6c1c18e7b1f50ab7d81ace95b36efffef9ef7`
`font_02_sfnt_off00011d5e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D5E	4324 bytes
SHA-256: `d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378`

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