PDF malware analysis — malicious · 6b74235b7c2b4e92

MALICIOUS

PDF

84.3 KB Created: 2021-06-08 21:48:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13

MD5: db377b1e50261fb1bbea4e978c9d95a5 SHA-1: e42015f314f6ea5b6a0a15c5646259d07acdd886 SHA-256: 6b74235b7c2b4e92927632be8f0ac76c1dcc6976cdeabd23e711669ff7bfca99

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many pointing to link farms hosted on disposable domains, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. One prominent URL, 'https://drafthe.ru/pbw?utm_term=numerical+ability+question+and+answer', is presented as a lure for 'numerical ability question and answer'. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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://drafthe.ru/pbw?utm_term=numerical+ability+question+and+answer PDF link annotation
- https://static.s123-cdn-static.com/uploads/4375077/normal_600660a6f194c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4452595/normal_603010058ac48.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4462345/normal_605b7d4bb862f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4449781/normal_603ea637239f2.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369164/normal_6027f40f25720.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4417213/normal_5fdfadebeaa4b.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4463785/normal_5ff088f2d903e.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://tejudafo.pbworks.com/w/file/fetch/144818469/56663094058.pdfIn PDF document text
- http://natizasex.pbworks.com/w/file/fetch/144577728/jivaliratuseguwawez.pdfIn PDF document text
- http://niluputevi.pbworks.com/w/file/fetch/144452247/jozugopagonixuxejajenep.pdfIn PDF document text
- http://kimotamiju.pbworks.com/f/favozajigesaviv.pdfIn PDF document text
- http://jumedew.pbworks.com/f/why_does_ford_use_manual_locking_hubs.pdfIn PDF document text
- http://mujiwareneje.pbworks.com/f/space_shooter_mod_apk_download_for_android.pdfIn PDF document text
- http://dokajawema.pbworks.com/f/18806193882.pdfIn PDF document text
- http://xifatarege.pbworks.com/w/file/fetch/144554466/xajujosu.pdfIn PDF document text
- http://vibevekofano.pbworks.com/w/file/fetch/144584715/zisatazakajuxepukoxibel.pdfIn PDF document text
- http://sazupamufode.pbworks.com/w/file/fetch/144718206/ejercicios_caligrafia_script_para_imprimir.pdfIn PDF document text
- http://bokibagaror.pbworks.com/f/percy_jackson_and_the_olympians_the_lightning_thief_book_pages.pdfIn PDF document text
- http://pebokuvog.pbworks.com/f/77323737996.pdfIn PDF document text
- http://nusuwoxub.pbworks.com/w/file/fetch/144426882/bolokubukawiroj.pdfIn PDF document text
- http://mujusevo.pbworks.com/w/file/fetch/144479400/how_to_use_rpcs3_emulator_on_pc.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_off0000f3ee.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3EE	5512 bytes
SHA-256: `cea13008576f1e7c04ac9092c5c6ea5dc711a3a3666ca3f3a560b7a748ae1968`
`font_01_sfnt_off000106a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x106A2	11784 bytes
SHA-256: `8923975018eced9776a6b7b632100c7b886a90f1288c23a314dd59a595146079`
`font_02_sfnt_off00012e54.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E54	16140 bytes
SHA-256: `1ffca1ef16be5e2ec436e77f9211a88ad3199dc781cb76600401cc2e2c7dce6d`

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