PDF malware analysis — malicious · 98a6793ea43b69be

MALICIOUS

PDF

84.6 KB Created: 2021-04-20 21:20:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: a1ec917d38ceaa8873b72f38a6d61991 SHA-1: b3b652238e54031ac6b45de8f06d414a6c9cf277 SHA-256: 98a6793ea43b69be39c016e38e0090e92185670c525a0599c488e3ba1d253cf1

186 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 hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to facilitate initial access.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

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.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
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://xajibur.ru/strik?utm_term=stealth+camping+san+diego PDF link annotation
- https://cdn-cms.f-static.net/uploads/4369313/normal_600bda1231b5b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4415327/normal_60570ae342cf7.pdfIn PDF document text
- https://cdn.sqhk.co/zimopiroxab/cjfFjdr/49310919437.pdfIn PDF document text
- https://cdn.sqhk.co/kutajanode/ggig4f5/remote_legal_cashier_jobs.pdfIn PDF document text
- https://cdn.sqhk.co/wufotubi/V68Sghy/jawufajo.pdfIn PDF document text
- https://cdn.sqhk.co/xemugugafot/gdgiihd/73077565002.pdfIn PDF document text
- https://cdn.sqhk.co/teduwugevoki/jfhdVia/risk_of_rain_2_item_index.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4368223/normal_6034d22f23e52.pdfIn PDF document text
- https://cdn.sqhk.co/wazotifuk/hfRbVgi/lg_mobile_switch_app_apk.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4462696/normal_5fe61ac6798ce.pdfIn PDF document text
- https://cdn.sqhk.co/satasevubu/bCvUThh/sefetasiwirup.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4366302/normal_6000d3ee350ac.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_4b4d9e4ae50d40319d5da80ecd0ac96a.pdf?index=trueIn PDF document text
- https://0c82b12f-57ed-4e8c-8d48-54c40ae4c4e8.filesusr.com/ugd/205ae4_9b172cbacdd44d24901e1fcee4388117.pdf?index=trueIn PDF document text
- https://689a2394-1721-4ce0-b6f7-af9f1dc0d621.filesusr.com/ugd/0f5b72_27a4da48192a4ad496b3903ce74c809b.pdf?index=trueIn PDF document text
- https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_9abdc8920d494889bc548027539cb1cd.pdf?index=trueIn PDF document text
- https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_3a48e6e230e0403183aef6a65aaae650.pdf?index=trueIn PDF document text
- https://1c8fadd7-09eb-4d2b-9d42-8e747ba5ce52.filesusr.com/ugd/60625b_f11d45a9dd8c4ef99605e0082d75e4ab.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f6f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6F0	5492 bytes
SHA-256: `66c833850651c6346071174f10695b040580360715708077c23e6edf9ef82347`
`font_01_sfnt_off00010977.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10977	10744 bytes
SHA-256: `6c8efcf9a578af8d7208036417700178b08a0b9d33d316899b7b39b9a04c6b0e`
`font_02_sfnt_off00012e7e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E7E	16060 bytes
SHA-256: `503f5200e83b189a546b6c6e1d808633a9135186956fe76ff9bd78de3d91e3c6`

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