PDF malware analysis — malicious · a08a4530dc447a9c

MALICIOUS

PDF

76.6 KB Created: 2021-03-17 07:54:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25

MD5: dad4a8532dc06ea2ae627e16dc819dc5 SHA-1: d2577af59af6e4755666067ff78ae44730089ec0 SHA-256: a08a4530dc447a9cb7a6d89fc3340ebe8180328e42a5e8b65b1aa505d2338176

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many of which are part of an SEO link farm, and one specifically points to a redirector URL. The document body, though heavily obfuscated, appears to be a lure related to a product manual, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the malicious linking.

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.
Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK

PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
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://zajinet.ru/wix?keyword=t-fal+fr8000+manual PDF link annotation
- https://mulomaninivoxom.weebly.com/uploads/1/3/1/4/131437045/pokupurevotazi-zugozumaxurane.pdfIn PDF document text
- http://figuxovutofid.mygamesonline.org/creative_writing_ideas_for_young_adults.pdfIn PDF document text
- http://feelslike35.com/international_gem_and_mineral_show_denverb23fk.pdfIn PDF document text
- http://about-central.com/98170591329r3vjp.pdfIn PDF document text
- https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/c13e477c.pdfIn PDF document text
- https://bujetukojijem.weebly.com/uploads/1/3/4/8/134875379/c2fa6139abd9.pdfIn PDF document text
- http://wijetaz.mypressonline.com/8540282974.pdfIn PDF document text
- http://wide-do.top/barcode_font_excelydh9x.pdfIn PDF document text
- https://zudasejavezumuj.weebly.com/uploads/1/3/4/0/134017640/77365f41038b.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/legipalofi/pedajubemejililet.pdfIn PDF document text
- https://s3.amazonaws.com/zuwosil/check_engine_light_codes_on_jeep_grand_cherokee.pdfIn PDF document text
- https://s3.amazonaws.com/tufujifinobiro/91037393315.pdfIn PDF document text
- https://s3.amazonaws.com/dedinavesute/dagarikazikebof.pdfIn PDF document text
- https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_bb49fd98a3574694a1b121c29548ac81.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/jonora/purchase_requisition_format.pdfIn PDF document text
- https://s3.amazonaws.com/kagedatabujo/gorimefemodirenuji.pdfIn PDF document text
- https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_1f1ff760c5f8408fb17298dbadd4b716.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/xanunafojuloki/seventh_day_adventist_doctrines.pdfIn PDF document text
- https://s3.amazonaws.com/gifojuxaxeva/70038341441.pdfIn PDF document text
- https://bb491b24-4c81-4ccc-8daa-bf1baeb171c2.filesusr.com/ugd/93c935_d150e12d82694b159a2649ef7a76a212.pdf?index=trueIn PDF document text
- http://wufagezigedo.onlinewebshop.net/93405554021.pdfIn PDF document text
- https://s3.amazonaws.com/dufekifaral/honda_3000_psi_pressure_washer_replacement_pump.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_off0000ef4e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEF4E	5052 bytes
SHA-256: `cbffd14e76a23dcb0744c694fe9c262b8338e9401a7afefca261bd02e8283d26`
`font_01_sfnt_off00010067.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10067	10864 bytes
SHA-256: `e554e828fdeaa1cdfb32b2dd6c7a04e8f1b404ff38d67305b77e1aa0bedec3ad`

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