PDF malware analysis — malicious · c4e79dd6054cb727

MALICIOUS

PDF

84.4 KB Created: 2021-03-29 00:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24

MD5: 54ff0f80d7bc90c7e1740e5bfdeda4f4 SHA-1: 2b635d836fb78b44ddd704f2f12559c32706f4ac SHA-256: c4e79dd6054cb727e6390aed45ed9e16282902d2f47e2aba62d5f74894ef4348

224 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE

PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
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.
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://yafferge.ru/123?utm_term=indeed+attention+to+detail+assessment+test+answers In PDF document text
- http://securitycheckingbrowservkcom.xyz/31290126717ey69j.pdfIn PDF document text
- http://musomojil.mywebcommunity.org/47599734762.pdfIn PDF document text
- http://importants.space/sakazenefekikuo9w7z.pdfIn PDF document text
- http://bisapusid.mypressonline.com/business_english_books_free.pdfIn PDF document text
- http://mibikazut.mypressonline.com/balance_sheet_decoded_book.pdfIn PDF document text
- http://wosozage.mypressonline.com/39898459198.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4421473/normal_601ef168e4f8a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379498/normal_601b174b1836f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4393635/normal_6049bc9722507.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/cf05dd61-4ef2-47b8-bffb-ad32253170c7/19090081511.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/670127e5-0cde-41cc-9b98-4bceb2ac5774/54627599546.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/29c788ac-405e-499a-8352-33b3b3a1585e/54724642445.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/98ebc541-d5d8-4ed2-8c52-1e755be2b72f/bolt_action_vs_semi_auto_308.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/9766d6ba-4db3-4b6a-b539-12da30237bb7/94879905356.pdfIn PDF document text
- https://74df6fe0-557b-4e47-8461-f2df536053d0.filesusr.com/ugd/4dcf4e_8b546034199941ee8e501ac6b0e24b8c.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/0120f609-ccc0-42c7-a0db-31f4a5092537/dnd_5e_ee.pdfIn PDF document text
- https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_96473a32686b4d7d9ba99555ed494a92.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_off0000fcf6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCF6	4788 bytes
SHA-256: `581abf64fb2c463860a73ce00912408602f4404096f79bfaec4217de9d91bd24`
`font_01_sfnt_off00010d25.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D25	12016 bytes
SHA-256: `547647d2d2c2bd4f0c151b0ae269f76b0fe21223e6e2b4f74a3f60d3f4048f9d`
`font_02_sfnt_off00013622.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13622	4324 bytes
SHA-256: `7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71`

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