PDF malware analysis — malicious · 0ea73dac60adae38

MALICIOUS

PDF

74.3 KB Created: 2020-11-14 04:17:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14

MD5: 5efeca5a012cab5f45ef1079d212f5c5 SHA-1: 7205c38d19f4166b8ca6113b49ca72649583823e SHA-256: 0ea73dac60adae380186ea93ad09e846f60b049ca5b694a3f5b3be8c73c861cc

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

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://traffnew.ru/strik?utm_term=surface+area+calculator+calculus PDF link annotation
- https://sixexarujizevav.weebly.com/uploads/1/3/4/5/134584368/6497300.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4387929/normal_5fa81e9d1655a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4378393/normal_5f9ab264595d9.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4422897/normal_5fa2159a59e36.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4378846/normal_5f8e258135e79.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4367645/normal_5f89c1ec750a8.pdfIn PDF document text
- https://sebezudo.weebly.com/uploads/1/3/4/0/134042436/7674194.pdfIn PDF document text
- https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/1228819.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4383791/normal_5f8f31a8e2caf.pdfIn PDF document text
- https://kazajiti.weebly.com/uploads/1/3/4/4/134456981/724389bba2.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4415951/normal_5f9e0216893ed.pdfIn PDF document text
- https://tojuxumisadef.weebly.com/uploads/1/3/4/7/134714483/tafosa_jojudunivojup.pdfIn PDF document text
- https://tebebutak.weebly.com/uploads/1/3/4/7/134744698/vabukoguzinix.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4412996/normal_5f9ee4ef4d652.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4393189/normal_5f90bbb135635.pdfIn PDF document text
- https://mumixopid.weebly.com/uploads/1/3/1/8/131872042/guxiz.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/530884e2-5077-4139-b0b4-8874ecf01e3f/wowaro.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/789df5ae-9fc2-4420-938e-1d8641f7dab7/rafarokunasokupogobagusaf.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_off0000d78f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD78F	4704 bytes
SHA-256: `f45af9ab32d38562622e1afd9a7436a5263fa7706eefdce5e447cfc952b9682d`
`font_01_sfnt_off0000e793.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE793	11392 bytes
SHA-256: `6f89e0e4f043f4d061bff999abd84198ab4cb39a103f69d37928a35328afff0f`
`font_02_sfnt_off00010e0e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E0E	4324 bytes
SHA-256: `cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34`

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