PDF malware analysis — malicious · 3a492a1a45e5f8bc

MALICIOUS

PDF

111.6 KB Created: 2021-04-04 16:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: 2df9a8d6e76c5eed7eae9b7e4fe7e983 SHA-1: 10f303f7108db505b06b5b33e30ebbd9d342b5bb SHA-256: 3a492a1a45e5f8bc451b448aac0639c194844463051e3b998f29853f36e6cb68

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous external URIs were extracted, pointing to domains associated with link farms and disposable hosting, indicating a phishing or redirection attempt. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the lure of external links.

Machine Learning

Nyx PDF Classifier malicious score 0.9977

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
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://lozipotod.ru/strik?utm_term=theories+of+second+language+acquisition+stephen+krashen PDF link annotation
- http://kipokefurur.mygamesonline.org/jubitutines.pdfIn PDF document text
- http://fomoregekamikat.mypressonline.com/pokevijofagelupagin.pdfIn PDF document text
- http://meinekarten.best/jebijemisafofifipidzyp3z.pdfIn PDF document text
- http://getdouche.xyz/tifepepomilabiluvakulinarorbv.pdfIn PDF document text
- http://guitar.su/english_to_french_technical_dictionary7yiqu.pdfIn PDF document text
- http://jujavekerubeko.scienceontheweb.net/tunoseletawomameso.pdfIn PDF document text
- http://twitter-center.com/vh1_rupaul_all_starsm1oxh.pdfIn PDF document text
- http://save50it.info/7628675825193xqv.pdfIn PDF document text
- http://kopogaxepaku.sportsontheweb.net/47788840583.pdfIn PDF document text
- http://zuvalasit.mypressonline.com/25710389678.pdfIn PDF document text
- http://theporte.xyz/a_christmas_carol_by_charles_dickens_chapter_2_summaryrp2do.pdfIn PDF document text
- http://dupuladusudired.mypressonline.com/21718266310.pdfIn PDF document text
- http://netolenogafa.getenjoyment.net/venemibanivilafiboluwas.pdfIn PDF document text
- http://goproonly.com/kidde_smoke_detector_manual_p12040cahfmwj.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/fe0b5b20-7422-4373-abd9-4dceb3a33aa7/xuwuzozivul.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/23cbe6ce-5d9b-42fc-a151-f098ca79c03d/nyssma_manual_32.pdfIn PDF document text
- https://s3.amazonaws.com/kakekojezutok/vudoxe.pdfIn PDF document text
- https://s3.amazonaws.com/dovulavavo/69131608382.pdfIn PDF document text
- https://s3.amazonaws.com/wewuxuviwar/senutenaxapikimuxizexif.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/40984711-dfe6-4158-9219-7f2c4da85eef/falunoxegituk.pdfIn PDF document text
- https://s3.amazonaws.com/bezorito/76913628377.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/30cc11d6-acfc-488c-b1a4-40688eb41e4a/zujakubixogufitajotob.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/3a3952d9-8e68-4e6d-acd4-b79ba6b3fb19/pegimalur.pdfIn PDF document text
- https://s3.amazonaws.com/sowewazulejewi/56405200361.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off000161a5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x161A5	5556 bytes
SHA-256: `bbd4633deb9cc812515a63b8e7c4a574921125aa524b33cbbf468f885d4566e7`
`font_01_sfnt_off0001747c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1747C	10932 bytes
SHA-256: `2b56988f2b79a80420f0b54d33e4c443d097e599bbadda272b416a8c7f0783e3`
`font_02_sfnt_off00019a10.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x19A10	16204 bytes
SHA-256: `541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501`

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