PDF malware analysis — malicious · af9eaf6f6f0b6a7d

MALICIOUS

PDF

75.1 KB Created: 2021-03-21 08:29:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: f7bbad05f1c6d67cd441c0b3bc11b507 SHA-1: b68df6b4795ae9e8a25a493f1cd55c30180d6282 SHA-256: af9eaf6f6f0b6a7d1dc3644cda9784379806baf7b22e2491d77ea095c9786dff

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The primary URL, https://jumiwimov.ru/wix?keyword=ol+reliable+meme, further supports the lure of a 'meme' to drive traffic to potentially malicious or unwanted content. No scripts were extracted, but the PDF structure itself is used to host and link to external resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/wix?keyword=ol+reliable+meme PDF link annotation
- https://tipuzivi.weebly.com/uploads/1/3/0/9/130969377/lorujodavojeruje.pdfIn PDF document text
- http://appletopshop.ru/726878983151j1fm.pdfIn PDF document text
- https://gizisojanixagep.weebly.com/uploads/1/3/4/4/134495782/fulivurapigolidi.pdfIn PDF document text
- https://vakexojukesazi.weebly.com/uploads/1/3/0/9/130969985/numageju.pdfIn PDF document text
- https://minazunanuvisim.weebly.com/uploads/1/3/4/6/134666394/2428982.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4452846/normal_60054735112ff.pdfIn PDF document text
- http://covidcapsule.world/sojofidokosafoxafuku4p7b0.pdfIn PDF document text
- https://betutoza.weebly.com/uploads/1/3/4/8/134899773/vemoje.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4484169/normal_602eb61ca3eea.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4475379/normal_60053e41d4269.pdfIn PDF document text
- https://xizirogubo.weebly.com/uploads/1/3/0/7/130776043/xipexopigupebej-kofulew-femox-rewufutoko.pdfIn PDF document text
- https://vabiwedewu.weebly.com/uploads/1/3/0/8/130813601/sugalawezulepuwixiga.pdfIn PDF document text
- https://gupobotinifetex.weebly.com/uploads/1/3/4/3/134338345/lupig.pdfIn PDF document text
- http://in-arenas.com/geometry_and_its_applicationssz7gz.pdfIn PDF document text
- https://zulatikuwa.weebly.com/uploads/1/3/0/7/130776211/lomejogesuzofix.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_35275bdbaa76405e91d791ca702a40a8.pdf?index=trueIn PDF document text
- https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_8b58b692b6c84f0d98d18ff3d145b52e.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/vosimalume/jobudobapupebod.pdfIn PDF document text
- https://s3.amazonaws.com/satudifin/lefatepewova.pdfIn PDF document text
- https://s3.amazonaws.com/tenunud/77696245309.pdfIn PDF document text
- https://s3.amazonaws.com/lewuli/serial_extraction_case_report.pdfIn PDF document text
- https://s3.amazonaws.com/rorives/variables_in_psychology.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_off0000e864.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE864	4820 bytes
SHA-256: `e8f38fba305f8a6ca938c0a1310e4ec4667fd92c22cf46f1f485a31739e88213`
`font_01_sfnt_off0000f8aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF8AA	11472 bytes
SHA-256: `02bf07d0a12c68e526d65c7c371ccabbfa0599806be8f85da7208c36f3744f87`

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