PDF malware analysis — malicious · d7a79b8e59f5b54f

MALICIOUS

PDF

80.5 KB Created: 2021-03-16 03:55:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22

MD5: 8057d35b2cfa581622543a0fd6418c8c SHA-1: 202ec5cde20095bde3681649a9b11883fe2e8a4d SHA-256: d7a79b8e59f5b54fd7920f59104b93c447a9a704328217dcc8ad4fc0645d5206

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to known malicious infrastructure, specifically a URL containing 'yafferge.ru' and 'utm_term=western+digital+my+cloud'. This indicates a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious nature of the file. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 5

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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 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://yafferge.ru/strik?utm_term=western+digital+my+cloud+wdbctl0020hwt-00 In PDF document text
- http://xebupalifu.22web.org/llc_operating_agreement_template_utah.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4502870/normal_5fe7f5c389481.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4453550/normal_5ff4420777f09.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4481273/normal_5fe654382964d.pdfIn PDF document text
- http://xusibuvuzos.22web.org/anatomie_de_l_oeil_humain.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4366024/normal_5fec1fa96c2d5.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4403680/normal_5fdcf7a41d468.pdfIn PDF document text
- https://gosasomaf.weebly.com/uploads/1/3/4/3/134370397/6279686.pdfIn PDF document text
- https://roxewakedenal.weebly.com/uploads/1/3/1/4/131483042/4949933.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4411709/normal_603d89229ddc4.pdfIn PDF document text
- https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/865092.pdfIn PDF document text
- https://cdn.sqhk.co/vegedusovo/jgiecNN/best_tech_news_websites_podcasts.pdfIn PDF document text
- https://paleforekirito.weebly.com/uploads/1/3/4/5/134579508/gofuji_givopemewikan.pdfIn PDF document text
- https://cdn.sqhk.co/tokebamojos/cLjfEhg/kefunuzadoxorel.pdfIn PDF document text
- http://fusitekive.iblogger.org/22746316170.pdfIn PDF document text
- https://vodesaladamaju.weebly.com/uploads/1/3/5/2/135298616/guwawozovur_zevinisos_kupiva_kafowev.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4483338/normal_600ee6b8f0d97.pdfIn PDF document text
- http://www.opentle.orgIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/nafoxuda/fawajalutogupenig.pdfIn PDF document text
- https://s3.amazonaws.com/donake/free_yearbook_templates_for_mac.pdfIn PDF document text
- http://sanigafekok.epizy.com/what_does_l_o_mean_on_a_thermometer.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://www.gnu.org/licenses/gpl.htmlIn 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
`stream_003_off0000f851.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xF851	7920 bytes
SHA-256: `5ee99c0d68996b1576ebb512126e17996f6f25b9f15d060c73030d7a8eac3454`
`font_00_sfnt_off0000e3f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE3F0	6004 bytes
SHA-256: `96117d212e77327bc61e8181b49ecc078be995130106606c7993e6e712f25997`
`font_02_sfnt_off00010dcc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DCC	11192 bytes
SHA-256: `62784fb57e787c8a8906f64165fe48c31e05dad5687bf782428ca5ded1246cd1`

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