PDF malware analysis — malicious · 63ae955dc8fd0674

MALICIOUS

PDF

92.2 KB Created: 2021-05-20 15:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13

MD5: 8507202ee8610bffcb1684fc6f8e69c3 SHA-1: e64d18b974a7d68d9af3e548976e937ee9a02de8 SHA-256: 63ae955dc8fd0674feb5775b0b12e9c7527139edf6d21928e42e3ff96549c6cc

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 SEO redirectors, indicating a link farm or phishing attempt. The presence of a critical ClamAV detection and ML classifier flagging strongly suggests malicious intent. The primary URL, https://jacksth.ru/strik?utm_term=hikvision+2mp+ip+camera+pdf, appears to be an SEO redirector used to lure victims with a seemingly relevant topic.

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://jacksth.ru/strik?utm_term=hikvision+2mp+ip+camera+pdf PDF link annotation
- https://cdn-cms.f-static.net/uploads/4481663/normal_6033f71deaa77.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4388427/normal_60158ebd16f05.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4470543/normal_604a4a794e01e.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4448332/normal_5fcdb8c91f5d3.pdfIn PDF document text
- https://sutenemumam.weebly.com/uploads/1/3/5/3/135323571/1082e45b55fb26.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4370078/normal_6049d426341c0.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4379726/normal_5fdf31bcc4e10.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4389581/normal_5fdd1447d47c7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4446170/normal_601dfacc0e081.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4411683/normal_60675ad2a42ac.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4387224/normal_6034375843b86.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4474448/normal_5fd18ec04fc9c.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://s3.amazonaws.com/zidosozawok/adobe_photoshop_fix_apk.pdfIn PDF document text
- https://s3.amazonaws.com/bewibiwat/guberojozumedotesax.pdfIn PDF document text
- https://s3.amazonaws.com/pigolo/robazoxurubuwuzusivazixe.pdfIn PDF document text
- https://s3.amazonaws.com/xopugup/injury_report_chiefs_vs_chargers.pdfIn PDF document text
- https://s3.amazonaws.com/posufij/bisamuvapemoligomef.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f3b4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF3B4	5196 bytes
SHA-256: `827d83672eb6d9da992111419c883993357ac57f87a7756d61378d5f52f68951`
`font_01_sfnt_off0001052f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1052F	26224 bytes
SHA-256: `f221a4eefd84e433a75b409d69eaaf2c8ab583841d9447f9fcd88584e72de7ea`
`font_02_sfnt_off00013ea7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13EA7	16204 bytes
SHA-256: `e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15`
`font_03_sfnt_off000153d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x153D5	4324 bytes
SHA-256: `9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2`

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