PDF malware analysis — malicious · 9b90b3f3817f2d53

MALICIOUS

PDF

78.1 KB Created: 2021-05-20 15:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23

MD5: 5ccb51f26ff7492c6daa85ab67cfde03 SHA-1: 295a73928ece2385eff392ac30394ec32e2923fc SHA-256: 9b90b3f3817f2d53773a52a2cd5eb1c3bd6e5676b6dd22fee156e02a49984357

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to other PDF documents, indicating a link farm or SEO spamming tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9992

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://golowaki.ru/strik?utm_term=rodrigo+amarante+tuyo+ringtone+download PDF link annotation
- https://cdn-cms.f-static.net/uploads/4424400/normal_60404ac9c5182.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4380383/normal_604db8187e6b8.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4491151/normal_604244c19876e.pdfIn PDF document text
- https://nobewiga.weebly.com/uploads/1/3/5/3/135315034/7e3b48c2f13a.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4480898/normal_5feec65a82c43.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4478148/normal_6003ae413d9a5.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4454967/normal_5fcf1ff8a4c54.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4482623/normal_6048156c0317d.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4377931/normal_6032c5d0babdd.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4393644/normal_6034e9eb4a4b5.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379964/normal_606cd01e25b2c.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4420610/normal_5fc574845cf15.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4481168/normal_604a40e1205f8.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379362/normal_602faf08b33d2.pdfIn PDF document text
- https://pojojozujivalim.weebly.com/uploads/1/3/1/1/131164399/girovulovasila.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379370/normal_606595c1116a7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4498678/normal_6061b75559444.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4501367/normal_60420bd28e830.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4475852/normal_604d18d790e84.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/341aed54-9740-4246-987a-94303d547182/what_to_do_at_a_final_inspection.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a7f3c112-2067-4f65-9ee1-0932d620e990/how_can_i_update_my_samsung_j3_software.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/50e254d8-81b8-451f-b015-a1d7ca190d11/a_feast_for_crows_chapter_38.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b120f4e3-f322-45fb-8cb3-44ba7c4cce8e/can_you_use_the_bissell_crosswave_pet_pro_on_carpet.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_off0000e72b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE72B	5168 bytes
SHA-256: `924d974e6d228ae05d8809d0c4bb2e76cc7de90e4acdd05f798ec09add85e235`
`font_01_sfnt_off0000f8bc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8BC	2140 bytes
SHA-256: `3eadf3ff1ae85f7a2dd8be852d633ca148c1d24200a16cbd4325889adc5789c4`
`font_02_sfnt_off00010296.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10296	11260 bytes
SHA-256: `44748b685832a36da0a2bf59b8dd190a613a18d8cabd1eb1b9fbc2c390485a2f`

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