PDF malware analysis — malicious · a4078372f52d413f

MALICIOUS

PDF

73.0 KB Created: 2021-06-09 17:08:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18

MD5: b12926ebf98892a17c04deec60e7664a SHA-1: bb6c7152418bb557c203c5a11d78ccbe2b976145 SHA-256: a4078372f52d413fa3fc0f2c29c6342fc7f1b1de8c68cc8d513e43a0ac60cbc3

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as a link farm and detected as malicious by ClamAV and an ML classifier. It contains numerous external links, with a primary suspicious URL pointing to a domain associated with phishing. The document's structure and embedded links suggest an attempt to redirect users to potentially harmful content, likely for credential harvesting or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://nomylo.ru/pbw?utm_term=happy+birthday+gif+animated+with+sound PDF link annotation
- https://cdn-cms.f-static.net/uploads/4369901/normal_60226ad65d291.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4503874/normal_5fd1991ab9395.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4450350/normal_5fd0ba426e4ef.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4457849/normal_60450b09d4302.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4449973/normal_601fb2c8efce7.pdfIn PDF document text
- https://kubamugikogili.weebly.com/uploads/1/3/4/5/134508843/difilojufonujol.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4367000/normal_605d5d259dda0.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369329/normal_604ab5928d75b.pdfIn PDF document text
- https://pajopujo.weebly.com/uploads/1/3/4/3/134305169/nesiseva.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4401983/normal_602d3eff72ad4.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4481540/normal_6040a164258d7.pdfIn PDF document text
- https://nedovewa.weebly.com/uploads/1/3/5/3/135316636/cd43f7604f.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4421365/normal_60092d13cf01d.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4494136/normal_5ff905ff9f4ab.pdfIn PDF document text
- https://biteledazuxol.weebly.com/uploads/1/3/4/3/134315761/vaxureriza.pdfIn PDF document text
- https://jomufoxubibad.weebly.com/uploads/1/3/1/1/131164047/6bcf2554.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://uploads.strikinglycdn.com/files/6631b9c8-f0d9-4d50-aae8-82b82ea8adf6/what_will_be_visible_in_the_night_sky_tonight.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/5279309e-2358-4028-9cc0-db664390e02d/dagajari.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/881ffa4b-4d7a-43ba-abbe-66418c7f160f/the_heart_asks_pleasure_first_book_karuna.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/91269df7-3ff0-432b-b953-27427bd3dc60/ejemplo_de_investigacion_exploratoria.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/84630955-3187-47a9-861b-64b78a60338e/la_ciudad_y_los_perros_resumen.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/25bae5c0-c4bd-4db7-93ba-f555039271b1/arabic_grammar_book_in_bangla.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/82184928-5c46-4902-8add-65444e4b5dad/mabakume.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_off0000d1da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD1DA	5600 bytes
SHA-256: `015590818ae472a82fbbb6fe534b5d06c5fa60fe22a94ffc1d73c53cdb35e37e`
`font_01_sfnt_off0000e4c2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4C2	10460 bytes
SHA-256: `9fa96fc66c976925419b02882f66e597aedbd8ff2d3b1a216efa9ae5c9577e2d`
`font_02_sfnt_off00010814.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10814	4324 bytes
SHA-256: `b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c`

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