PDF malware analysis — malicious · 6d056f31b9db2587

MALICIOUS

PDF

90.0 KB Created: 2021-03-01 00:21:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21

MD5: d2149b5e7b66790258e693ff382714e2 SHA-1: 725adbc43edf84481351bf25d9f4ab42bffeed24 SHA-256: 6d056f31b9db25877d877daa59df9f6c99a06ff5801b1241f041642ad251e40c

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to a link farm on disposable hosting, and the 'SE_DOWNLOAD_BUTTON' heuristic suggests a lure for users to click a link. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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 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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://vilenefex.ru/strik?utm_term=jazz+chord+progression+guitar+tab PDF link annotation
- http://kixurox.getenjoyment.net/wisaler.pdfIn PDF document text
- http://gejudoxe.mypressonline.com/lodixaxeze.pdfIn PDF document text
- http://zizodoroluxonaf.sportsontheweb.net/42293464429.pdfIn PDF document text
- http://ganitigusawev.mygamesonline.org/the_standard_hotel_miami_fl.pdfIn PDF document text
- http://pofuxubilet.sportsontheweb.net/dijojagiduse.pdfIn PDF document text
- http://luwinilulurop.mywebcommunity.org/wiledojowedifumewawekuli.pdfIn PDF document text
- https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/zijubowipajiwefopawi.pdfIn PDF document text
- https://gavedomosuzutu.weebly.com/uploads/1/3/4/2/134234743/6315381.pdfIn PDF document text
- https://tuwakunasuj.weebly.com/uploads/1/3/0/8/130874309/06743458438.pdfIn PDF document text
- https://petizigosi.weebly.com/uploads/1/3/4/9/134903326/ragitezovujuga.pdfIn PDF document text
- http://tomolijoponix.mypressonline.com/is_a_2013_hyundai_sonata_a_good_car.pdfIn PDF document text
- https://kadekorik.weebly.com/uploads/1/3/1/4/131453454/7c1e1023.pdfIn PDF document text
- http://xuxetosufuzo.getenjoyment.net/jenusis.pdfIn PDF document text
- https://mapogukokerezat.weebly.com/uploads/1/3/5/9/135987870/50cf5.pdfIn PDF document text
- http://wejowadizabudex.mypressonline.com/53552672237.pdfIn PDF document text
- https://nilesezijifata.weebly.com/uploads/1/3/4/8/134885493/6d811.pdfIn PDF document text
- http://juwupexutaval.mywebcommunity.org/dell_optiplex_9010_cpu_i7.pdfIn PDF document text
- http://lupelisizi.medianewsonline.com/star_citizen_game_package_npc.pdfIn PDF document text
- https://lijuvimu.weebly.com/uploads/1/3/0/7/130775306/vuxorudejimofi.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://ralirajuz.atwebpages.com/bemeluvovozoxewiposokelow.pdfIn PDF document text
- http://xekazaz.myartsonline.com/marvel_super_heroes_adventure_gamebook.pdfIn PDF document text
- http://kuzemepusiloj.onlinewebshop.net/27682079210.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ef6b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF6B	11860 bytes
SHA-256: `56404191de602d58b470cd5d639ae955d471030142c0cb3e2c15701ec0fa330f`
`font_01_sfnt_off00011629.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11629	5484 bytes
SHA-256: `ac11dd99cade24d2b1931c0f14bf2f8054f6cfa167d91b2e3754de3d6286b251`
`font_02_sfnt_off000128c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128C8	15628 bytes
SHA-256: `2aa3c860f522745709d98818792524778d1baefe08cfce212206a98e525db1c3`

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