PDF malware analysis — malicious · 77948e28a7550eec

MALICIOUS

PDF

79.9 KB Created: 2021-03-14 17:02:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22

MD5: 0372d148c6d4f526b491b6e74432627c SHA-1: 9ed0a8b19275a8810563d5c9c14031ffd758ca36 SHA-256: 77948e28a7550eeca04de47de9a040a2f5497bc20faa7ed964fb7bbb351ebdb5

204 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many of which are part of a link farm, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of 'cmd_commands_for_hacking_wifi.pdf' in the document text, alongside external links, points towards a deceptive lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 7

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.
LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND

Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
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://leonvi.ru/strik?utm_term=idioms+dictionary+apk+download PDF link annotation
- https://cdn-cms.f-static.net/uploads/4380536/normal_6037e240cb330.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4478928/normal_5fd8440a375f5.pdfIn macro / runtime command snippet
- https://static.s123-cdn-static.com/uploads/4421350/normal_5fce231355f5a.pdfIn PDF document text
- http://jekefidaz.mygamesonline.org/sc_dmv_road_test_score_sheet.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://s3.amazonaws.com/retobifulipo/cmd_commands_for_hacking_wifi.pdfIn PDF document text
- https://s3.amazonaws.com/bevarolimesale/76489013091.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/bd39396c-1c79-423b-8a6d-db47f133bcba/unofficial_game_of_thrones_cookbook.pdfIn PDF document text
- https://s3.amazonaws.com/tumuzu/dukukusisusuvero.pdfIn PDF document text
- https://1ac5d900-0c69-4f12-8b1d-4e209472b8d2.filesusr.com/ugd/828753_65a2a59d3f7c454f8a39e8ee91296254.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/0668d72a-d991-476c-8aaf-d2d10b369d2d/wokolifol.pdfIn PDF document text
- https://s3.amazonaws.com/futamo/john_deere_42c_mower_deck_parts_diagram.pdfIn PDF document text
- https://s3.amazonaws.com/fosagoba/nijonuvelo.pdfIn PDF document text
- http://lusajafimaneru.myartsonline.com/xusobikuwinep.pdfIn PDF document text
- https://s3.amazonaws.com/megujobemegor/glenshee_mountain_snow_report.pdfIn PDF document text
- https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_fa73d4279e194ea6bd11d54c1904527a.pdf?index=trueIn PDF document text
- https://5fb42ee6-a9be-400a-98f2-f9d4b9f720c8.filesusr.com/ugd/1813b3_8a69cbe8575c473a91519c35212a2d13.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/kudefem/signatory_authority_letter_format_for_gst.pdfIn PDF document text
- http://senesijosezetu.myartsonline.com/89371893768.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
- https://s3.amazonaws.com/bIn macro / runtime command snippet
- 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_off0000ed33.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xED33	5084 bytes
SHA-256: `acaa4da24433d4126386c4f283074d15c24d73e8da03c33389ec5620caa8fc67`
`font_01_sfnt_off0000fe70.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE70	11168 bytes
SHA-256: `98d3c1c27dd1a12b0db074049509fe95223158d6dbfb871a311e56799875fa10`
`font_02_sfnt_off00012488.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12488	4324 bytes
SHA-256: `9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2`

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