PDF malware analysis — malicious · 02b4488602db2f25

MALICIOUS

PDF

108.4 KB Created: 2021-03-14 18:11:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07

MD5: 6d5a969cb71733c95affa4a654430678 SHA-1: 4bc26e2a952b289f1f929a6f637fc7239a963bfd SHA-256: 02b4488602db2f2504b80c302c3a7f15279541f67e6e525878a41df43a9034bb

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains numerous external links, a common tactic for link farms and SEO abuse, with one specific URL identified as a credential phishing lure impersonating Microsoft. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit user interaction via embedded links.

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
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 high 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: call-to-action link host does not match the impersonated brand: https://fokemale.ru/wix?keyword=covalent+bonding+tutorial+answer+key.
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://fokemale.ru/wix?keyword=covalent+bonding+tutorial+answer+key PDF link annotation
- https://cdn-cms.f-static.net/uploads/4408589/normal_6018bac7723b8.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4367311/normal_6013bc99091bf.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4373261/normal_60385bec1dee1.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4382948/normal_5fe2bab181161.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4457011/normal_5fdd6ac31ad0e.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/sonutopexaramuf/yahoo_fantasy_football_draft_sheets_printable.pdfIn PDF document text
- https://c2093f15-f4fb-4bda-9582-db5404103fa6.filesusr.com/ugd/b28561_d95ceafc150b4454b904a065984ed791.pdf?index=trueIn PDF document text
- https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_56b51dae78d14e06b0d8f4fc23dac07a.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/mubefula/larife.pdfIn PDF document text
- https://s3.amazonaws.com/nokiva/autoformation_windev_17.pdfIn PDF document text
- https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_1b869328b3464a4485ba3b3ab1e6cf07.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/xajowu/basedekoguses.pdfIn PDF document text
- https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_7b748879fa204b7caef10918eb97d5ce.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/xujitezu/39232384642.pdfIn PDF document text
- https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_4e8085c906104dd4a5a1a737b0469fce.pdf?index=trueIn PDF document text
- https://37bdae34-bb2f-403f-997c-54a7c09d9c06.filesusr.com/ugd/dc98cc_fcce3a3ba4ef4b7aa1e856eef2ffa0e5.pdf?index=trueIn PDF document text
- https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_abdeaf559f6a474ca0d0f3b9bb4ed705.pdf?index=trueIn PDF document text
- https://944bcc21-9f45-42c2-9889-8cf837fa5d1c.filesusr.com/ugd/50f869_19e743793fc24e2ca7630cfb0f54e85a.pdf?index=trueIn PDF document text
- https://0cc2a7d0-6f33-4335-9ec9-554d9418487e.filesusr.com/ugd/cb4a18_06a01173ea5e49d8887545b49335409b.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_off0001625b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1625B	2828 bytes
SHA-256: `b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a`
`font_01_sfnt_off00016c56.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16C56	5356 bytes
SHA-256: `7f80a8097a695d77d5d5d94b8472ec8e9228d06d7164f012cde5a6a5c8f3222f`
`font_02_sfnt_off00017eb0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x17EB0	10448 bytes
SHA-256: `0aeb3ccbe74137880c814b6113155c444eace48b9cf8f90f7288d1a71265d930`

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