PDF malware analysis — malicious · 27b93cc3d29803d4

MALICIOUS

PDF

75.5 KB Created: 2021-03-20 01:57:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 53a38d8809e4d3c41e7175e8dc6a5590 SHA-1: e0028f19e12196082833e4160a2ca3691b9217af SHA-256: 27b93cc3d29803d4e80dbba414e863c3b722a905ab6ecb2c7bcea06891864fd4

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many of which point to redirectors designed to obscure the final malicious destination, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK heuristics. The primary malicious URL identified is https://jumiwimov.ru/strik?utm_term=sas+enterprise+guide+7.1+pdf, which is likely part of a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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://jumiwimov.ru/strik?utm_term=sas+enterprise+guide+7.1+pdf PDF link annotation
- https://static.s123-cdn-static.com/uploads/4448720/normal_5ffb58d908bc7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4471091/normal_60461d26d5156.pdfIn PDF document text
- https://cdn.sqhk.co/dexizajifu/jeVN3Ue/kipatos.pdfIn PDF document text
- https://cdn.sqhk.co/mopomotop/aDMC3hj/mexiguvesezozofif.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4475391/normal_604065136fa76.pdfIn PDF document text
- https://cdn.sqhk.co/vifutetax/fLogc7l/earth_hd_free_edition_apk_download_free.pdfIn PDF document text
- https://cdn.sqhk.co/mugolino/aXQhheU/35004044115.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4476436/normal_60552ff4a7a72.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/mujevubutukoxu/84563332557.pdfIn PDF document text
- https://s3.amazonaws.com/jutenojamega/the_lottery_free_download.pdfIn PDF document text
- https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_59cbaba29c7c4515991953bda410ddbd.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/wurivuve/cybex_550t_treadmill_manual.pdfIn PDF document text
- https://s3.amazonaws.com/wovedukevikov/tupolebaludaka.pdfIn PDF document text
- https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_048d00068e834116a0929fcb0bf09953.pdf?index=trueIn PDF document text
- https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_0e637b6a6fe3458db11fe3dc8ad9de45.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/pazatuv/chevrolet_cruze_2011_service_manual.pdfIn PDF document text
- https://s3.amazonaws.com/labitajaxatufib/vebuvigeduwuzomak.pdfIn PDF document text
- https://s3.amazonaws.com/lovomijelun/16031578268.pdfIn PDF document text
- http://lumawasisoxo.rf.gd/zapuporobesakeb.pdfIn PDF document text
- https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_0b35c01d36684a1caa38d2dd0fc293ef.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/votawawo/tuwex.pdfIn PDF document text
- http://lemaponodo.epizy.com/sacred_geometry_meaning_of_triangle.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_off0000eb11.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB11	5444 bytes
SHA-256: `b17c09bd9865da44e6e32e16f2795b8cd5462176416c3e2c1a332be3e0227179`
`font_01_sfnt_off0000fdb6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDB6	10224 bytes
SHA-256: `8c97fb4a59f00f01f26e18f3ac75af66206599cbf2251b599c7094a82b0703f0`

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