PDF malware analysis — malicious · 9f5aa05460da81f8

MALICIOUS

PDF

78.6 KB Created: 2021-04-21 10:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 213be2dc1add96542c044be199d05c55 SHA-1: 7a31b431f8dce4d568293168c792a9d85ee6ef66 SHA-256: 9f5aa05460da81f8e82322798382c53230f581e2e35c3a7c586f30c4fbfc418b

186 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, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malicious content or conduct phishing. The primary malicious URL identified is https://mezovuduw.ru/strik, which is likely used to redirect users to a malicious site.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

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 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://mezovuduw.ru/strik?utm_term=how+to+replace+nixon+sentry+watch+battery PDF link annotation
- https://cdn.sqhk.co/difixoruze/hghiaje/guide_for_lifeafter_season_3_episode_11.pdfIn PDF document text
- https://cdn.sqhk.co/luketopaja/3YVhg6b/capture_camera_android_app.pdfIn PDF document text
- https://ziruxirunilexa.weebly.com/uploads/1/3/0/7/130775543/7605156.pdfIn PDF document text
- https://cdn.sqhk.co/repudodo/S4zhehc/download_j2me_loader_for_pc.pdfIn PDF document text
- https://zitejapaj.weebly.com/uploads/1/3/1/8/131872087/vezul.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/5db14ef2-0f19-4fbe-b896-d99af7de192a/what_should_a_college_admission_essay_look_like.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/79efbce7-864b-4080-9cb2-f856f8f08083/87902691087.pdfIn PDF document text
- https://s3.amazonaws.com/wujapu/enjoy_the_silence_sheet_music.pdfIn PDF document text
- https://f6ea5e03-7e7c-4dce-82ee-fd5d223759ef.filesusr.com/ugd/d203ad_0b333967d3274009a99028cdc9693794.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/58cd738a-5433-45d3-b653-9bb03f06e28a/ley_4_2017_canarias_boe.pdfIn PDF document text
- https://b147a2f3-58af-4013-9def-597e86e94513.filesusr.com/ugd/47d6bb_100ca7fb52b64806ab5989c227ce99e4.pdf?index=trueIn PDF document text
- https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_09bd6aff19c84d69a663902211a97178.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/zobuwubedak/philips_led_t8_spec_sheet.pdfIn PDF document text
- https://s3.amazonaws.com/limepusotanal/annexure_2a_format.pdfIn PDF document text
- https://d872ce2a-2baf-4032-ab86-ab75b2f66d52.filesusr.com/ugd/338562_596026ec863c46288362b8ca4783fe30.pdf?index=trueIn PDF document text
- https://def05634-b969-4265-beeb-1e7d695e9a44.filesusr.com/ugd/6865ce_32c81db705274345ab85f666d37fded4.pdf?index=trueIn PDF document text
- https://c941d99d-b58b-4215-81ce-525e38db2b81.filesusr.com/ugd/2dc4cf_074ed2d8cbe54150ac7a612d8eedaed3.pdf?index=trueIn PDF document text
- https://eed7fa7e-4f31-4ba6-8269-e73f07ac74c5.filesusr.com/ugd/93374d_66ad601e509b4ee78be3b8166da7acfa.pdf?index=trueIn 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f3c8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3C8	5384 bytes
SHA-256: `6833e9c569802f173f12c80fed29ccfcafb6ebe8cef8d4e651bc9be8ef88588a`
`font_01_sfnt_off00010623.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10623	10740 bytes
SHA-256: `c9cf28dabab56c101f33a8c2e6e7d8bada5bf80024f4540543fa85da8cdd8703`

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