PDF malware analysis — malicious · d9d3235a859c120f

MALICIOUS

PDF

73.2 KB Created: 2021-03-09 18:03:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25

MD5: 54de3f0c26866d9651fa46df218567ae SHA-1: d8b6bb64236e68836e19cf77d1da9ee2a973e451 SHA-256: d9d3235a859c120f2b055b31fbc8aaa5b6f9016943d4af00fa2d05e768e74682

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or SEO spam document. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, contains keywords related to academic resources, which are likely used to disguise the malicious intent and attract unsuspecting users.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

Heuristics 6

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

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://kuzutuzo.ru/award?keyword=annotated+bibliography+rubric+pdf PDF link annotation
- https://cdn.sqhk.co/rikopekela/jijojcv/42244531890.pdfIn PDF document text
- https://cdn.sqhk.co/muwazubivotu/ikpFjhL/luxosakelufi.pdfIn PDF document text
- https://cdn.sqhk.co/wujukipako/NVgdBgc/53557036284.pdfIn PDF document text
- https://cdn.sqhk.co/turanexode/IihijjK/free_download_mp3_music_italian.pdfIn PDF document text
- https://cdn.sqhk.co/zapoboveje/ig05ij6/shark_attack_game_roblox.pdfIn PDF document text
- https://cdn.sqhk.co/sakiforivona/ETgfNjT/server_definition_for_resume.pdfIn PDF document text
- https://cdn.sqhk.co/gutipefu/UojidCj/97056706394.pdfIn PDF document text
- https://cdn.sqhk.co/kigaratak/rjglWhh/69350091717.pdfIn PDF document text
- https://cdn.sqhk.co/takejirasomu/cjabZji/robzone_duoro_xclean_profi_hasznalati_utmutato.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://d064ede3-316f-4d13-8ec5-014b2136b3bd.filesusr.com/ugd/154db6_64fd9d31754440f4ad1935d66b9b4a3b.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/bulikowexunepov/interior_design_responsive_website_templates_free.pdfIn PDF document text
- http://sidiwen.epizy.com/zuvewoxulekuporezavom.pdfIn PDF document text
- https://af0fe010-594a-4ec7-a26b-e2d78e33490d.filesusr.com/ugd/7d2910_4226c49021674b06a21996f6fdaa6df5.pdf?index=trueIn PDF document text
- http://pemukusa.epizy.com/antivirus_for_pc_2019.pdfIn PDF document text
- https://s3.amazonaws.com/wixatax/rofaxafer.pdfIn PDF document text
- https://s3.amazonaws.com/rumezo/99500474902.pdfIn PDF document text
- https://s3.amazonaws.com/wutogugej/design_rubber_stamp_template.pdfIn PDF document text
- https://37976aa0-f55f-47d3-847a-8d185b13ebf6.filesusr.com/ugd/1d6212_aa8314c30add4834b84e395bf68173fc.pdf?index=trueIn PDF document text
- http://bojefej.epizy.com/pinimexoru.pdfIn PDF document text
- https://s3.amazonaws.com/miledu/28627919233.pdfIn PDF document text
- https://s3.amazonaws.com/rilexazejuzovep/zavoneganatitu.pdfIn PDF document text
- https://s3.amazonaws.com/vuzotisenixava/6220190996.pdfIn PDF document text
- https://s3.amazonaws.com/dedinavesute/wapozemoribulupivobizoxe.pdfIn 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_off0000e297.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE297	5468 bytes
SHA-256: `3e277648eab4ea613edc15b82ec36edded7b8cde6dbebb4d56f1925474d566bf`
`font_01_sfnt_off0000f538.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF538	9944 bytes
SHA-256: `f3cae99cedc33ae57b51e8bd12a58858d6faa0ca1f6a5a851291c6f9bcc2a09d`

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