PDF malware analysis — malicious · 5daeccb558ceff05

MALICIOUS

PDF

79.5 KB Created: 2021-03-16 09:41:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: e18ce649c647f7b04779be8678c2ca0d SHA-1: 7b6c8a98be17e3f25c66db6e1757556553ad13f9 SHA-256: 5daeccb558ceff0513f3bc60176754ed57dac47e9a901da845595b1cdeec0b79

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly support this attack pattern.

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://pelibifir.ru/123?utm_term=quimica+inorganica+peter+atkins+pdf+descargar PDF link annotation
- https://cdn.sqhk.co/wixadigizal/bhithb5/vuzalifapefezapig.pdfIn PDF document text
- http://femetorisufi.sportsontheweb.net/relipis.pdfIn PDF document text
- https://demufejaxesogop.weebly.com/uploads/1/3/4/5/134588496/dejejemomojof.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4380226/normal_602331dc01791.pdfIn PDF document text
- https://maladekokox.weebly.com/uploads/1/3/4/7/134745457/gilajiletif.pdfIn PDF document text
- https://bobifadilow.weebly.com/uploads/1/3/5/2/135295989/dawawirebutapegon.pdfIn PDF document text
- https://cdn.sqhk.co/kerodamajop/K7Dshhu/2pac_dear_mama_lyrics_video_download.pdfIn PDF document text
- https://cdn.sqhk.co/norejasiwiza/gdN7Uie/good_pizza_great_pizza_chapter_4.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4420239/normal_6036cb7da2930.pdfIn PDF document text
- https://tatabano.weebly.com/uploads/1/3/4/8/134850833/gajib_tutasiwa_silimina.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4374843/normal_601db09474877.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4420915/normal_5fd8cd21cfa57.pdfIn PDF document text
- https://ferezarital.weebly.com/uploads/1/3/4/8/134862234/7660224.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://19508648-7f28-415f-8121-b57715dc1465.filesusr.com/ugd/9734e7_9f6b366b7e074233b59ef9c6f4e81c3e.pdf?index=trueIn PDF document text
- https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_52c0acca2559462b9ff53c86d9305708.pdf?index=trueIn PDF document text
- https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_83f5abc4a1b9427583b899ecc4da1f16.pdf?index=trueIn PDF document text
- http://xonolori.atwebpages.com/anatomy_and_physiology_handbook.pdfIn PDF document text
- http://dapekafuxururo.myartsonline.com/union_budget_2020_18_highlights.pdfIn PDF document text
- https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_80005a46ba2c4653994677386e7a7e24.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dfec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFEC	5448 bytes
SHA-256: `19daec0e8fa72d0583e86d6d2674223ef40c03c31897f2657e791699718c45b3`
`font_01_sfnt_off0000f25d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF25D	15492 bytes
SHA-256: `0efa11d2f7ea4b9c303477901a8b1c96824d21c710f49941fd77e791b870253b`
`font_02_sfnt_off00012281.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12281	4324 bytes
SHA-256: `0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333`

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