PDF malware analysis — malicious · b8b6ef06a446f83c

MALICIOUS

PDF

75.9 KB Created: 2021-06-14 01:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24

MD5: e674befa8449a11e61edb1365e698b9a SHA-1: d3d45b95d834cdb81c7defcd37531bbc779e626e SHA-256: b8b6ef06a446f83c2215ac75e1c039a307053d617700239505d84e338c065d9b

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document contains numerous embedded URLs, many pointing to link farms and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://huntic.ru/pbw?utm_term=words+that+start+with+h+and+end+with+o PDF link annotation
- https://cdn-cms.f-static.net/uploads/4407781/normal_6028eb92c2e36.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4467277/normal_5fdc44a34f36c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4365600/normal_60356e5e9a654.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4474750/normal_602f40fc4075f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4410217/normal_5fd93a78cb310.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4403130/normal_60bf1936be78f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4372696/normal_603ba8000e0ed.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366369/normal_6061709483eb1.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4407996/normal_5fe5740b3342b.pdfIn PDF document text
- https://static.s123-cdn-static-d.com/uploads/4458389/normal_60b1b2f77eebd.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4371524/normal_5fef730f7e9cc.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4422637/normal_602ef97b74205.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4449766/normal_6009f733ed316.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
- http://vomedujel.pbworks.com/f/kukisugiwuku.pdfIn PDF document text
- http://wikoborumun.pbworks.com/w/file/fetch/145272081/discord_profile_picture_for_different_servers.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/9316fbd6-4aea-427d-a3ae-e85a9f6dae04/46806816710.pdfIn PDF document text
- http://jutifakukap.pbworks.com/f/22839563957.pdfIn PDF document text
- http://molitutolu.pbworks.com/w/file/fetch/144546066/what_to_play_when_bored_on_pc.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/205fc5d4-e667-429a-923c-295a1e44575d/words_that_start_with_super_root.pdfIn PDF document text
- http://xifatarege.pbworks.com/w/file/fetch/145105959/lexasebolinowutojun.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d18f1206-13e1-4452-865f-01470496dc22/what_makes_a_great_public_relations_specialist.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/4a836b7f-03c9-463b-bb1b-c706b1a56fa0/43462674080.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_off0000dd82.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD82	4776 bytes
SHA-256: `640e4033fe3ead54fe1c549ae8ae3846d13ca3ffdf160182a0fbc6b084dbd89d`
`font_01_sfnt_off0000edc7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEDC7	10676 bytes
SHA-256: `466abfb465bd43bdb0ee06e610d2a755387706f95de7c3ef9bd872d75b2552a2`
`font_02_sfnt_off00011206.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11206	4324 bytes
SHA-256: `1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e`

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