PDF malware analysis — malicious · 9c71837359ff7fb8

MALICIOUS

PDF

76.1 KB Created: 2021-05-30 21:20:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: 8bc6250c57cd83bf7364f9cf9762c4d2 SHA-1: 41d784a743b81c408ba58c6719b0d53dd3d84bb8 SHA-256: 9c71837359ff7fb85b6d2bec265a547c1e5dd2dc5ad462ee8f19b3d33661bcd6

216 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF document flagged by multiple heuristics as malicious, including brand-impersonation credential phishing and ClamAV detection. It contains a mass external PDF link farm, with one URL specifically impersonating Microsoft. While no scripts were extracted, the PDF structure and embedded URIs suggest an attempt to lure users to malicious sites for credential harvesting.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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.
Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH

Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://rikolalevagamer.weebly.com/uploads/1/3/1/1/131164452/xakemo.pdf.
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://jottigo.ru/123?utm_term=firefox+android+bookmarks+location PDF link annotation
- https://static.s123-cdn-static.com/uploads/4426953/normal_600460cab364c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4456372/normal_605d4791c2bee.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4481667/normal_5fd69f0105af4.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4443594/normal_604190bf1a01c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4425229/normal_6010d679075da.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4527357/normal_5fd86f8f99ceb.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4421040/normal_5ff7acefc85cc.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379726/normal_600bff50ee797.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4462056/normal_606014e02baf3.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4476767/normal_6005af6fb4fd1.pdfIn PDF document text
- https://rikolalevagamer.weebly.com/uploads/1/3/1/1/131164452/xakemo.pdfIn PDF document text
- https://soxodoma.weebly.com/uploads/1/3/4/6/134695887/2935547.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4530323/normal_603c3c9e319ef.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4413712/normal_5ff77381aa362.pdfIn PDF document text
- https://kepelawurolunuz.weebly.com/uploads/1/3/4/0/134017158/kowupazuga_maxuregegufef_fikuvi_kitaforimebix.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/5c2b61ce-ddfb-4211-9182-773d952aee8c/2nd_grade_fraction_worksheets_printable.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/28b72512-1bc0-4de1-9c27-fc697e662b1e/mibitud.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/bb7bde3f-130f-4215-a937-ad350511db8c/othello_book_amazon.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/97bf0ee0-a0a7-47b1-972f-53ef42a2053f/98600575925.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e7e2e7c0-8d95-4f62-8f59-def779472d52/general_knowledge_questions_and_answers_free_download_in_hindi.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_off0000e0d0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0D0	5392 bytes
SHA-256: `b88cf8cc055785be65f919976d67d7dce5ead66c5ac67645cab23938cb5e3efb`
`font_01_sfnt_off0000f316.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF316	1936 bytes
SHA-256: `21a7146106e2ad29a4dcc6aa55cee169416400570e2b3d493b6d071cb256f2f3`
`font_02_sfnt_off0000fc58.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC58	11200 bytes
SHA-256: `305917aac9151bcf8cc2b6477cb83afd78d87e97cfe5a01a4f98338b0123ef11`

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