PDF malware analysis — malicious · cd714b434a4a4332

MALICIOUS

PDF

100.1 KB Created: 2021-04-10 13:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 811cd9c75de2bff39933a0d6c3884876 SHA-1: 7eadb6121e1b9f127418d8df0ff4023478c7a932 SHA-256: cd714b434a4a43329b6503b5d084c7005ee5edba55d9eec5cd7306877957d7d6

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, flagged as a link farm, with one prominent URL leading to zajinet.ru. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 5

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.
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://zajinet.ru/strik?utm_term=doro+mobile+phone+manual
- https://cdn-cms.f-static.net/uploads/4477164/normal_603eb81c2b1f1.pdf
- https://cdn-cms.f-static.net/uploads/4459058/normal_604cdfae18e13.pdf
- https://cdn-cms.f-static.net/uploads/4470399/normal_60402d833b2ed.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- http://scripts.sil.orgThis
- http://www.fontrix.comhttp://www.nhncorp.com
- http://www.daltonmaag.com/
- https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_731c524b70964a38bc55e10315aaaf4b.pdf?index=true
- https://s3.amazonaws.com/womirofop/xuvofumujodevebafaseki.pdf
- https://uploads.strikinglycdn.com/files/11e6f43b-6916-4265-9312-a109b8078bc3/star_trek_fleet_command_battleship_parts.pdf
- https://160e4e15-e27a-4ef2-9b26-f67fc0969a86.filesusr.com/ugd/cbdbb6_d9e7e5d7c9c14ae4ac6f6438be2b4c12.pdf?index=true
- https://s3.amazonaws.com/tinivukedeta/ruzixomavivunumabef.pdf
- https://uploads.strikinglycdn.com/files/bb0bc1e5-9770-4865-82a6-551af57ed41c/wotifuz.pdf
- https://uploads.strikinglycdn.com/files/b090526f-f3b9-45e7-8d2a-c94f9dfa70d3/voluborixe.pdf
- https://f6180879-d31b-499c-8e42-fead7842c491.filesusr.com/ugd/007227_d469a8232a044ee2b6d4d0158c1e11e6.pdf?index=true
- https://s3.amazonaws.com/wupixufekijax/saucony_guide_iso_4.pdf
- https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_21cff19935ea45bdb33f5fb6aa6cd2e0.pdf?index=true
- https://a22c3535-4c29-4f26-bf6b-1e631d3648e5.filesusr.com/ugd/28986c_432c828158ff45488aef9eb659cef225.pdf?index=true
- https://s3.amazonaws.com/sefukirexuwekij/nizaxated.pdf
- https://3e3188f7-d9e9-48da-9af6-4e6760718ee0.filesusr.com/ugd/4f7562_d42cd5b0f1f2420194ff70a15b80d1a3.pdf?index=true
- https://66e0d7df-d9e6-4599-8f92-a47fa3a4044c.filesusr.com/ugd/8b97dd_00c1066810624ceeae6dd05461ffc4e8.pdf?index=true
- https://6f8cb219-4830-455d-9ced-b55e65700e85.filesusr.com/ugd/fd30ac_60058d436cec42a3a22c0b97ae935a32.pdf?index=true
- https://s3.amazonaws.com/geraromu/cbr_cbz_reader.pdf
- https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_f7c8de41146641ab943ac3c2b659fea9.pdf?index=true
- https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_2ae5e0a84beb464da4b38cd8d25c7847.pdf?index=true
- https://d2faa26e-66ca-44cd-8f84-883624a71019.filesusr.com/ugd/dbbfd0_72635cf4fce14628b16fc43dbada172f.pdf?index=true
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://scripts.sil.org/OFL
- http://scripts.sil.org/
- http://scripts.sil.org/OFLAbyssinica

Extracted artifacts 6

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f312.bin` `514472cbce02e9759000c00d3dd5aa15d6bf037e32034928e4b222d04a0b1bb9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF312	4820 bytes
`font_01_sfnt_off00010336.bin` `47165bcaf1d2e468f10ce2b88939da1397074b228d569cc641687571d32731fd`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10336	20640 bytes
`font_02_sfnt_off00012237.bin` `acbed9160126cdce690946cb8cb02fbe995ed744b73022b1445a7ac24bfd1807`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12237	3656 bytes
`font_03_sfnt_off0001313b.bin` `8b9f1a3558d097fa6c37e3b892aa293ce235601129bf985fd2d0b7a9e72d32e5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1313B	10976 bytes
`font_04_sfnt_off0001565b.bin` `1907c15eb253be0f7fa8dc64c4f1fcbc4cdeea03a6e02d929d50ddf16e90e254`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1565B	9260 bytes
`font_05_sfnt_off000171d8.bin` `9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x171D8	4324 bytes

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