PDF malware analysis — malicious · f8f748861920aed4

MALICIOUS

PDF

79.6 KB Created: 2020-12-24 22:52:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07

MD5: 23067fd889807d40b455d2a5ba0f9f54 SHA-1: 7dd705334689284d6d0d80ac08a13b061a3faafe SHA-256: f8f748861920aed4d8cad1dcd731becb2314865c5d2ed108e70d1283e529dde5

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a lure related to a 'chocolate cake recipe' but is flagged by ML classifiers and ClamAV as malicious. It embeds a URL, https://trafffe.ru/strik?utm_term=chocolate+cake+recipe+with+raspberry+jam, which is likely used to deliver a secondary payload or conduct phishing. The PDF structure and embedded content suggest it's intended as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 4

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://trafffe.ru/strik?utm_term=chocolate+cake+recipe+with+raspberry+jam PDF link annotation
- https://cdn-cms.f-static.net/uploads/4443610/normal_5fac56e9831d0.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4374024/normal_5f9e46dc9f11b.pdfIn PDF document text
- https://nubawobadeg.weebly.com/uploads/1/3/4/1/134131997/7128053.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4414169/normal_5fcb2e6fc1649.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4411935/normal_5faad5ddac7ff.pdfIn PDF document text
- https://cdn.sqhk.co/wupifufexix/eUjWfhe/how_to_cook_pot_stickers_in_the_oven.pdfIn PDF document text
- https://cdn.sqhk.co/kilatelazobe/zYaggbS/coin_master_free_spins_link_2019_app.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/a06fb0a5-98d6-45fb-bcd3-5a77f3e968f6/liraxinexijozew.pdfIn PDF document text
- https://s3.amazonaws.com/rixevozajixezos/tipos_de_bullying_escolar.pdfIn PDF document text
- https://s3.amazonaws.com/pujinit/43579016180.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f915.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF915	5552 bytes
SHA-256: `07585ad5541ff29a50beec4f1ce680915b1a287d28ae63637bfef4728ec72890`
`font_01_sfnt_off00010bdd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10BDD	11068 bytes
SHA-256: `5df085e5f1a380274b3c1a5f08b0ec7f8555197534f6e0277f9b434437c56d65`

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