PDF malware analysis — malicious · fd619997f35a5d93

MALICIOUS

PDF

88.3 KB Created: 2021-06-03 05:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20

MD5: e6af36b25bbe3381c83e16fc18f7a6b0 SHA-1: 7e3182fadd555613eaf0f49356a551b51bf13611 SHA-256: fd619997f35a5d93026fd522607fe3e8f707efe2edb73c0a313b8027b238d8c2

196 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 dynamically generated and point to other PDF files, suggesting a link farm or SEO abuse for malicious distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may be part of a multi-stage attack where a password is provided to decrypt a payload. No scripts were extracted, but the PDF structure and external links are indicative of a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9983

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.
Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE

Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
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://chcial.ru/pbw?utm_term=biologia+del+desarrollo+gilbert+pdf+descargar PDF link annotation
- https://cdn-cms.f-static.net/uploads/4460042/normal_60b83528e2fca.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4418778/normal_5ffe49bcdf68f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4370269/normal_605b1df14baf3.pdfIn PDF document text
- https://milixugaxezo.weebly.com/uploads/1/3/1/8/131856079/sutuvesigezupemimo.pdfIn PDF document text
- https://narefipikabisip.weebly.com/uploads/1/3/2/6/132682930/pozipepi.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4365639/normal_60401c671b9fc.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4467979/normal_6044ff4446e2f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4391024/normal_6059fc1c7cae8.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4485310/normal_5fc813b25a229.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4447914/normal_601e0363b511e.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4381321/normal_5fd05c16e1b05.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4373520/normal_5fc611bce6d89.pdfIn PDF document text
- https://kuvutokejutal.weebly.com/uploads/1/3/0/8/130814176/tevikifarowem.pdfIn PDF document text
- https://jifedusibifep.weebly.com/uploads/1/3/0/8/130813848/soposis_larofor_pinujoxorixez_pibut.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/2cacc7d5-aaff-41f3-9f2c-896ed0cc6739/jotibufuxarifofil.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/1ab466ae-6233-401b-af59-dea319d920ba/what_are_good_ekg_results.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0698980a-8ee3-44c8-a544-b1d1a5c76934/94864441725.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/55dee112-c633-4c8d-aa89-c61ddb24393b/how_to_become_an_fbi_agent_in_the_behavioral_analysis_unit.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/63c607ce-8435-4006-85fe-06035f274c38/34587860398.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/f0b20bf0-aee8-4cb5-a25b-2e5d407d4b45/how_old_is_my_remington_11-48.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d466d5b6-f333-4abc-bfb2-aea43d50eed4/sesibomok.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/8758fa2f-21a7-4bb4-9ba5-f4c558ff4ab8/simcity_buildit_tips_epic_projects.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b296e864-cdea-4d1d-b1a1-57d6d2f4b514/how_to_reset_seagate_goflex_home_password.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/8014c764-0973-46a9-b717-c81b2fb752f3/boyka_full_movie_2018_english.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ea4d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA4D	7332 bytes
SHA-256: `16775f8b6b7be17fdcc2a83d65a25d57f296de9274830c168b1167b8576671f7`
`font_01_sfnt_off000102b1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x102B1	5512 bytes
SHA-256: `5616b4ed6f0199c466ebc1f21e69a9bf4b8276f41d982f46c46a21f95b4dbba2`
`font_02_sfnt_off0001157c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1157C	11304 bytes
SHA-256: `ee896bd4f6f29c860aae7e63c8f6936308ca59a2242a3d3d625847b44fcd35e8`
`font_03_sfnt_off00013b00.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13B00	16312 bytes
SHA-256: `c0da6dcbe8f88ce93fc1af2777ebbc92cd3bdc7e3187f1993d9ffe78df8fa77d`

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