PDF malware analysis — malicious · 16c44e803cd4a0a5

MALICIOUS

PDF

76.7 KB Created: 2021-03-19 19:11:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26

MD5: 6d04ec673e46fcde75b11ea992ca22c6 SHA-1: ac39d964bf38535c459788277997fff2c57c9e1b SHA-256: 16c44e803cd4a0a5c5b4bd3e4ccc9e23b0eb6a793177eab4d11facac04b98811

214 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of embedded links, forming a link farm designed to redirect users to malicious websites. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected it as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to an 'impossible quiz'.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

Heuristics 5

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
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://crophysi.ru/wix?keyword=impossible+quiz+37 In PDF document text
- https://cdn-cms.f-static.net/uploads/4500432/normal_60175a7bd3edb.pdfIn PDF document text
- https://cdn.sqhk.co/wupetutigo/Ejjigz1/54036635386.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4499334/normal_603ea3168a646.pdfIn PDF document text
- https://cdn.sqhk.co/zolulesar/jzEYifI/24666397296.pdfIn PDF document text
- https://cdn.sqhk.co/wirowanorax/DAGjhii/64180396463.pdfIn PDF document text
- https://cdn.sqhk.co/jomonufo/JvOha2U/toy_blast_update_apk.pdfIn PDF document text
- https://cdn.sqhk.co/wenavuso/foLgggi/bookworm_adventures_3_apk.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://02ee9779-94d6-4ec7-959f-c0f99fe19a35.filesusr.com/ugd/cdc607_1534bcbdc0f542a78aba4af95ae81633.pdf?index=trueIn PDF document text
- https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_d30c3df55f0742c5b0a7aa6299edceea.pdf?index=trueIn PDF document text
- https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_3fa41b5757674e6c861b2a21d1f4effd.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/fosagobomap/garmin_gpsmap_62_user_guide.pdfIn PDF document text
- https://71b4061d-0fbe-47a8-a671-08758978b022.filesusr.com/ugd/0216f2_50e789a69f3240baa5980dccfc681598.pdf?index=trueIn PDF document text
- https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_c789e34141ca43a6b44d3540191d96a0.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/filidabut/25435225521.pdfIn PDF document text
- https://s3.amazonaws.com/davubewu/13674569596.pdfIn PDF document text
- https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_cd039126b1094b7fbaf938cb2b368814.pdf?index=trueIn PDF document text
- https://ab0007c4-58ca-4db2-ab23-686bae4d53c1.filesusr.com/ugd/8bf248_be5622e77ea94f93ad4ab81b3d518dc6.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/gotitibekovi/verapom.pdfIn PDF document text
- https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_aae83ca37c404918a5d55463d101a446.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/jodabiladezot/dusojizavumabu.pdfIn PDF document text
- https://s3.amazonaws.com/ragejufa/25208173928.pdfIn PDF document text
- https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_77f958f9fb674b6495f8da2f4bf8eb36.pdf?index=trueIn PDF document text
- https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_b144d7bcdd944089b4a8b88a479727ac.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000efbb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEFBB	5156 bytes
SHA-256: `b1d7167b1dece47c2a1d8e68538d9ef9701286bd677b26cc23dbd4667f44f8cb`
`font_01_sfnt_off00010148.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10148	10720 bytes
SHA-256: `8fa235352883cb0f4f85f93ff5d73c3ba183112cae91f1bedffb704772783046`

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