PDF malware analysis — malicious · 01c1b52ce900d663

MALICIOUS

PDF

106.1 KB Created: 2021-02-28 22:00:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17

MD5: 5cdbc0fef6e59ebb4ea1761c1cdbc418 SHA-1: 20d44e45279d0d3cba8233775cb93923c058a884 SHA-256: 01c1b52ce900d6635b9b1d64e401b6142a6c45c1b7398344dec114828d89e192

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, 'https://midufefew.ru/award?keyword=asus+rt-ac87r+vs+rt-ac87u', appears to be a lure for search engine optimization. No scripts were extracted, but the PDF structure and numerous external links indicate a phishing or malicious redirection attempt.

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://midufefew.ru/award?keyword=asus+rt-ac87r+vs+rt-ac87u PDF link annotation
- http://faceit.su/51412200340yll0p.pdfIn PDF document text
- http://uscovidcharts.com/92912793336gqmd5.pdfIn PDF document text
- https://cdn.sqhk.co/dedizozife/LhaghQO/43008949392.pdfIn PDF document text
- https://cdn.sqhk.co/pofevadamem/SK40tDm/52086415881.pdfIn PDF document text
- https://cdn.sqhk.co/wepunajexiju/GOQD5hc/best_arabic_hashtags_for_instagram.pdfIn PDF document text
- https://zokefipevi.weebly.com/uploads/1/3/4/3/134311683/dekofofakij_vozitaxifow_rutunow_nanedapi.pdfIn PDF document text
- https://cdn.sqhk.co/fizuborugas/fib6wn6/idle_evil_clicker_cheats.pdfIn PDF document text
- http://afracheat4.xyz/ropasezofapt98l.pdfIn PDF document text
- http://pelistens.xyz/play_worm_game_online_freestvgn.pdfIn PDF document text
- http://doordash.link/speed_camera_motorcycle_helmetrirt4.pdfIn PDF document text
- http://bioforce-co.site/microsoft_office_word_2020_calendar_templater7ok3.pdfIn PDF document text
- https://tebijiburowuwe.weebly.com/uploads/1/3/4/8/134850880/simatesisi-gaxezedujazo.pdfIn PDF document text
- https://rotaxavevun.weebly.com/uploads/1/3/4/8/134884867/8786885.pdfIn PDF document text
- https://nidiladidubupa.weebly.com/uploads/1/3/4/7/134753920/f54c067c2c01.pdfIn PDF document text
- https://tidopotixasajev.weebly.com/uploads/1/3/0/7/130738881/fazugafuwefa.pdfIn PDF document text
- https://fakilopatezi.weebly.com/uploads/1/3/1/6/131606638/leninisat-sebim-sogoxuvujokada.pdfIn PDF document text
- https://zomereke.weebly.com/uploads/1/3/5/3/135397468/koveruf.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4421788/normal_5fcd04b829a40.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4493920/normal_5fd79fe5da7c0.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
- 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_off00015916.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x15916	4616 bytes
SHA-256: `c48caf5ad082615f7a540a601213254b495b7ceb53035248d5d22dd078fb4aa2`
`font_01_sfnt_off000168d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x168D5	10528 bytes
SHA-256: `5278a99fa30aa914385b20d0119bbccf7b0dfd47997d1feb1477f43bab064ded`
`font_02_sfnt_off00018cda.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18CDA	4324 bytes
SHA-256: `a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f`

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