PDF malware analysis — malicious · c166e2c58f0fdc70

MALICIOUS

PDF

82.8 KB Created: 2021-03-24 11:46:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 5b139407df232f3c644ec27837a863fa SHA-1: bd063690b2b9ed23838b26520d7dda49a1371454 SHA-256: c166e2c58f0fdc7078760f00cf18b3f9b0bb46c1eb80345448b1bcff6db0e25a

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are part of an SEO link farm, indicating a spam or phishing campaign. The primary malicious URL identified is vilenefex.ru, which is used as a redirector. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to drive traffic to malicious sites, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/award?keyword=bending+moment+diagram+examples+pdf PDF link annotation
- http://zoo-taxi.site/nitog4xttq.pdfIn PDF document text
- http://tutavizukatafoz.22web.org/57631649944.pdfIn PDF document text
- http://takimopunize.22web.org/naruko_tea_tree_sheet_mask.pdfIn PDF document text
- http://techanomic.com/50965688088zbx7c.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
- https://uploads.strikinglycdn.com/files/ed84da61-7d02-4413-b054-12eca0b243d6/how_to_clean_washer_filter_samsung.pdfIn PDF document text
- https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_5717c9a754eb4d10bfdd16eb1793dfd4.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/wazorixekunafob/wifi_splash_page_template.pdfIn PDF document text
- http://lojuwuwa.rf.gd/gebonexexijazipixikorolox.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/42d0f533-71d7-4db9-94ab-c28a5410854f/bisatowewesunumeme.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/4c974598-614e-4702-83b3-fa08a6a9c21d/the_boy_in_striped_pajamas_summary_chapter_1.pdfIn PDF document text
- https://s3.amazonaws.com/woberiz/transform_translate_css_property.pdfIn PDF document text
- http://belinoremujuk.rf.gd/zasexuxijoxuvoxaxojigage.pdfIn PDF document text
- https://s3.amazonaws.com/bamepofewalada/36513147667.pdfIn PDF document text
- https://s3.amazonaws.com/sinadi/amazon_kindle_unlimited_books.pdfIn PDF document text
- https://s3.amazonaws.com/mesixadelomomo/80211938868.pdfIn PDF document text
- http://puzuniposodaf.epizy.com/lexutazizopa.pdfIn PDF document text
- https://8533cbf3-c0d6-400c-bdf8-8ca38cf0242b.filesusr.com/ugd/135178_9c8f6e39da584ab7b1952c1e3242a580.pdf?index=trueIn PDF document text
- https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_5ebe00966bb04047a96a053d46533d1c.pdf?index=trueIn 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_off0000f85e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF85E	5268 bytes
SHA-256: `4c3ba042a555cb18ba19887668d94feb11543a2f4eab942976df188ccbef7900`
`font_01_sfnt_off00010a26.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A26	11440 bytes
SHA-256: `4a7b4188aa4aabc4472e7eeeb6da8aebbbe17511f84ab777a3dfe6dd8ac7122c`
`font_02_sfnt_off00013036.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13036	4324 bytes
SHA-256: `a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f`

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