PDF malware analysis — malicious · 6739c02772a4f3bb

MALICIOUS

PDF

80.9 KB Created: 2021-03-18 02:29:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20

MD5: b7b76aceeed4ea2ac7fe8a9b63a72008 SHA-1: 245c6f1c16529d91df0585051b5accaf161f888d SHA-256: 6739c02772a4f3bbc8570d50a922ab7b97d80927cadfb4f3bda60b2a83b893ce

244 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple critical heuristics, including PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM, indicating it contains a large number of links to potentially malicious or disposable hosting sites. The ClamAV detection and ML classifier further support its malicious nature. The embedded URLs suggest a phishing or link-farming attack pattern designed to lure users to external sites.

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
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
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://crophysi.ru/award?keyword=molecular+geometry+chart+pdf In PDF document text
- https://xuvelufuxilo.weebly.com/uploads/1/3/5/3/135387868/1650629.pdfIn PDF document text
- https://vaturelola.weebly.com/uploads/1/3/4/7/134704713/xegedivo-kojudedupe-muwexarikopeme-sanalug.pdfIn PDF document text
- https://demogevofowa.weebly.com/uploads/1/3/4/6/134608938/429506403c.pdfIn PDF document text
- http://lalabomujulimof.mywebcommunity.org/diguwazowoxopib.pdfIn PDF document text
- http://nakodinita.scienceontheweb.net/sememedelu.pdfIn PDF document text
- http://xinuvaro.sportsontheweb.net/rapul.pdfIn PDF document text
- https://golotarati.weebly.com/uploads/1/3/1/8/131856611/wupevojanu.pdfIn PDF document text
- http://ijmalan.xyz/mathematical_analysis_apostol_2nd_editionkms02.pdfIn PDF document text
- https://fotunerabo.weebly.com/uploads/1/3/4/0/134042859/bufere_xinadoguwerudi.pdfIn PDF document text
- https://febefadu.weebly.com/uploads/1/3/1/4/131453100/924984.pdfIn PDF document text
- https://gumopaxegekugod.weebly.com/uploads/1/3/4/0/134018731/e2cbd57c71a877.pdfIn PDF document text
- https://gusumumonabol.weebly.com/uploads/1/3/0/7/130775475/fexogusim.pdfIn PDF document text
- https://xefozevinunakab.weebly.com/uploads/1/3/4/3/134340699/tovuzip-nogipodukij-lejefapolerom.pdfIn PDF document text
- https://wedutigumufezeb.weebly.com/uploads/1/3/4/6/134659425/dinaxosalu-gejogilanaba-kipide.pdfIn PDF document text
- http://hookup682.site/internet_explorer_version_11mpqn7.pdfIn PDF document text
- https://begukuji.weebly.com/uploads/1/3/4/8/134880386/4375984.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/d54271dd-acd1-44ad-90c1-c21b220c74f5/wahl_hair_clipper_kit_canada.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/86a57dcf-bb9a-4027-891d-1b7f8a1caa84/jack_nicklaus_quotes_about_tiger_woods.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/cd9cc4c3-47f4-4e21-8f8a-2de8362860dd/ketaxo.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000fc22.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC22	5496 bytes
SHA-256: `017a56fcb71cfe1d5dfe8a43ff960aa0f7efb1dd4b9d2a44c87fac83922d1891`
`font_01_sfnt_off00010ec1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10EC1	11588 bytes
SHA-256: `fa19ebc99e4a41070e64143493793e9cff7c5b658981fc7c3003102e73d30888`

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