PDF malware analysis — malicious · cf343bc648614468

MALICIOUS

PDF

72.5 KB Created: 2021-02-28 06:43:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 41b5bf2f02bfeb828efd42973d18a2ea SHA-1: 6e6da821a3f4e76191ac59a2c9004369b7aa75d6 SHA-256: cf343bc648614468338c746de96bd215dbd2fd462ea06a72e782e47180ddc0fd

156 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 pointing to Weebly-hosted PDF files, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely initiated via a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://botokaw.ru/strik?utm_term=guess+the+brand+game+answers+level+17
- https://fumuzuwuwuwupu.weebly.com/uploads/1/3/0/9/130969925/9768703.pdf
- https://budovatepita.weebly.com/uploads/1/3/1/3/131398204/nikukowotoluvavexaji.pdf
- https://webimilosajepi.weebly.com/uploads/1/3/4/8/134859137/f9c012d6.pdf
- https://xatodibe.weebly.com/uploads/1/3/5/9/135966399/8937922.pdf
- http://zazafuzavap.22web.org/ms_word_dark_mode_windows.pdf
- https://razixolinatu.weebly.com/uploads/1/3/4/3/134384461/raxazume.pdf
- https://xuwuperozaposa.weebly.com/uploads/1/3/2/3/132303395/828397.pdf
- https://jarajegixam.weebly.com/uploads/1/3/1/4/131437089/a6a6c443a3c.pdf
- http://gesamakim.22web.org/zidosinilapozez.pdf
- http://nazhivy.net/38564366664sd2zs.pdf
- http://gonugotez.22web.org/33926516558.pdf
- http://ig-verifiedsbadge.com/nizosituekje9.pdf
- https://roginolesalit.weebly.com/uploads/1/3/1/6/131636974/komugevebefefok-badaga-jidole-mitemabuv.pdf
- https://vugovarekuluf.weebly.com/uploads/1/3/1/6/131607096/9940895.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ddc0.bin` `799cacf7e5e1212082c340c7c4febfa5b9408a091266c27461f765833a6942af`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDC0	5692 bytes
`font_01_sfnt_off0000f113.bin` `c116a2b9e2d58ab23c8ef58bd9724c664d149bcfe8f6f61260c715d7281c6234`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF113	10596 bytes

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