PDF malware analysis — malicious · 7789baacfca205c4

MALICIOUS

PDF

77.9 KB Created: 2021-02-17 23:19:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23

MD5: 73089ffbc1e85209176b8d816ad5a336 SHA-1: 570e5bbe39745cc4734f561320ada5ea41aefe90 SHA-256: 7789baacfca205c4d9881d3ecf2a25b2a88a9ccdaa89ae46b46b13694e3aaf99

226 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it is a link farm and a credential phishing lure, specifically impersonating Amazon. It directs users to a malicious PDF hosted on a redirector, which is a common tactic for credential harvesting. The ML classifier strongly supports the malicious verdict.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 7

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.
Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH

Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://nowiwadigomu.weebly.com/uploads/1/3/4/0/134018048/cb0cd42220.pdf.
Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE

PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
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://druttle.ru/strik?utm_term=how+do+you+reset+the+security+code+on+a+moultrie+camera PDF link annotation
- http://kapusta.pro/anemia_falciforme_y_paludismoesee4.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4381291/normal_6019a8d5154b9.pdfIn PDF document text
- http://hd-cam-mirror-up1.club/97558466534frlij.pdfIn PDF document text
- https://nowiwadigomu.weebly.com/uploads/1/3/4/0/134018048/cb0cd42220.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4469828/normal_5fd0e5b41b800.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4486743/normal_602290914f41e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4375353/normal_5feaef2d34173.pdfIn PDF document text
- http://worldworkbook.com/796613476967wg1j.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4367621/normal_602cf8a4be51a.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4501965/normal_600867528e946.pdfIn PDF document text
- http://securitycheckingbrowservkcom.xyz/school_management_system_phpdang6.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4425227/normal_601922ca1587d.pdfIn PDF document text
- https://sejesomizibiji.weebly.com/uploads/1/3/5/3/135346687/maxom.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://zagopemolal.rf.gd/bakersfield_college_campus_map.pdfIn PDF document text
- http://mubaviz.epizy.com/nuwukukiborubirurebiw.pdfIn PDF document text
- http://pezomovororiz.rf.gd/l_acidit_titrable_du_lait.pdfIn PDF document text
- http://gozozofufeb.rf.gd/logixoxalatifuza.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_off0000e70b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE70B	5216 bytes
SHA-256: `0a8251f8fbd660fbb879d9d48b5dc31a18361fd3b677ecad5f6f5b23b1ab1921`
`font_01_sfnt_off0000f8ac.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8AC	10348 bytes
SHA-256: `ec53048d6413710ef58d447b6bf28495e30e59b07815c3ce14aebf2ab630a77d`
`font_02_sfnt_off00011bf0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11BF0	4324 bytes
SHA-256: `ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3`

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