PDF malware analysis — malicious · 778bdf7d6a38bb12

MALICIOUS

PDF

80.9 KB Created: 2021-03-24 18:05:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 9c536d0ad0e9c5d6aa9c62c3d25007da SHA-1: e192d8722426ab0d7e2a3a5d47d7e2bf429f1393 SHA-256: 778bdf7d6a38bb1291728627499c776262de66d8a21b80add473f23a76c884a6

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high number of external links, many of which point to SEO-optimized redirectors designed to phish users or lead them to scam websites. The primary malicious URL identified is zajinet.ru, which is used in conjunction with keywords suggesting a free download lure. The ML classifier and ClamAV detection strongly indicate malicious intent.

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/award?keyword=kindle+cloud+reader+to+pdf+online PDF link annotation
- https://zunifoxorim.weebly.com/uploads/1/3/4/3/134320692/pipulomaxolod.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4446395/normal_601365cc75aba.pdfIn PDF document text
- http://lisolu.org/anniversary_card_with_photo_freetx6no.pdfIn PDF document text
- http://gebuhrenfrei-mein.com/academic_writing_course_online_free_australiay5i10.pdfIn PDF document text
- http://hotloveme.online/76022525543ye6zt.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4446636/normal_5ffbd5e30fa9e.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4486367/normal_5fec951ea401e.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4379387/normal_5feba5348e13d.pdfIn PDF document text
- http://xrootunited.com/46746612419m452s.pdfIn PDF document text
- https://rasofenetiko.weebly.com/uploads/1/3/4/8/134862321/gonakufewal.pdfIn PDF document text
- https://nuniladolu.weebly.com/uploads/1/3/0/7/130775245/f67a5c125829.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/voxipanovigepiv/reporte_de_trafico_autopista_mexico_queretaro_hoy.pdfIn PDF document text
- https://s3.amazonaws.com/dofufiri/31691142496.pdfIn PDF document text
- https://s3.amazonaws.com/jalasilunaz/how_to_install_a_bontrager_trip_100_computer.pdfIn PDF document text
- https://s3.amazonaws.com/zumomasugipeno/nesupoj.pdfIn PDF document text
- https://s3.amazonaws.com/lukepepe/original_bumblebee_transformer_1984.pdfIn PDF document text
- https://s3.amazonaws.com/woxewiwupir/isn_t_she_lovely_lead_sheet.pdfIn PDF document text
- https://s3.amazonaws.com/mavixu/solvency_ii_guidelines_eiopa.pdfIn PDF document text
- https://s3.amazonaws.com/gajabedafot/67703382493.pdfIn PDF document text
- https://s3.amazonaws.com/farezelof/bluetooth_software_for_laptop.pdfIn PDF document text
- https://s3.amazonaws.com/vuxalirudidel/do_smoker_boxes_work_on_gas_grills.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e9f5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE9F5	4940 bytes
SHA-256: `34ed0d27b012fa0b861dc6aead11cf6fa9b233ffe78182a753df95b6630279d1`
`font_01_sfnt_off0000fad5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFAD5	11032 bytes
SHA-256: `94180707e208a195144fe372200817259a77f6e07cb62c37028da4aad73661e9`
`font_02_sfnt_off0001204d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1204D	16312 bytes
SHA-256: `975089639afea594160f6daa1ae948ffc4125994d61a9fd32dce02580f7b6b15`

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