PDF malware analysis — malicious · ca9acb68cdd33464

MALICIOUS

PDF

72.2 KB Created: 2021-04-17 12:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13

MD5: 50899b55061abe23a8383bc02ded234f SHA-1: 5da2778c16f86c9c7f28b29edbec37414641b233 SHA-256: ca9acb68cdd33464db7e077db4476e4a7fa724a4ca2c7ef6cb77bb28527377da

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a link farm, containing numerous external URLs designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the document's purpose is to funnel users to potentially harmful external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=i+am+not+free+quotes PDF link annotation
- https://cdn.sqhk.co/pepupiribojo/gjWYSjb/72948240274.pdfIn PDF document text
- https://lowunidedalovel.weebly.com/uploads/1/3/1/3/131380213/buzak-kodimux.pdfIn PDF document text
- https://cdn.sqhk.co/senosekagoko/tiegcjh/download_popular_car_driving_game_apk.pdfIn PDF document text
- https://cdn.sqhk.co/bugininaxi/rvgc36Z/brain_stress_ball_canada.pdfIn PDF document text
- https://cdn.sqhk.co/puzadowoke/njhJmPk/fruit_ninja_classic_mod_apk_unlimited_money.pdfIn PDF document text
- https://cdn.sqhk.co/kuretunaba/zHtgjji/83263826514.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4370533/normal_6049caa249801.pdfIn PDF document text
- https://cdn.sqhk.co/vusutesilo/iehaZgg/smart_assistant_devices.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4480898/normal_5ffc88be51a03.pdfIn PDF document text
- http://waverufusufafuv.scienceontheweb.net/savudexukaxebi.pdfIn PDF document text
- https://cdn.sqhk.co/fejavegiwo/igjhdgf/adventure_quest_3d_leveling_guide.pdfIn PDF document text
- https://xoxulesajoxe.weebly.com/uploads/1/3/1/4/131438427/4580263.pdfIn PDF document text
- https://cdn.sqhk.co/savunowudob/3hbh2je/counter_terrorist_swat_strike_mod_apk_download.pdfIn PDF document text
- http://namabal.scienceontheweb.net/1076453059.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://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_513afeb1c8b2467e82d5ae0ce41131b2.pdf?index=trueIn PDF document text
- https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_61e218d047464f448d07033d515ddd77.pdf?index=trueIn PDF document text
- http://jelunegizubu.atwebpages.com/nironidudolikazatuwowofo.pdfIn PDF document text
- https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_33296d4bd739489ca02fc33b23a9267a.pdf?index=trueIn PDF document text
- http://xumuritikoxuk.myartsonline.com/surah_al_waqiah_rumi.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_off0000d205.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD205	4780 bytes
SHA-256: `277303e3ca8d4000344eacd91620b4f150068324fd75df64a4cdc3a5bb575363`
`font_01_sfnt_off0000e21e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE21E	10044 bytes
SHA-256: `1e613cf5bf0e238489c8a3a129a915ebf40f23ffee282469d599e5ccf4bc05fd`
`font_02_sfnt_off00010462.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10462	4324 bytes
SHA-256: `d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378`

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