PDF malware analysis — malicious · 52bb2b1807702ded

MALICIOUS

PDF

77.8 KB Created: 2021-01-21 12:48:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27

MD5: fb2545a2788d247d51f550f371102770 SHA-1: 2042d6632c2cf49078fd0ae24ac84c1ac3e7577a SHA-256: 52bb2b1807702ded3615fe647d3b44554c82b1fc88349276d6926f0935d56c83

244 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links pointing to external PDF files, many hosted on disposable domains or redirector infrastructure. This behavior is indicative of a link farm, likely used for SEO manipulation or to distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, aligning with phishing or trojan 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
PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK

PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
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.
Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM

Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
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://ggtraff.ru/123?utm_term=queen+regnant+of+england In PDF document text
- https://cdn.sqhk.co/wodigajamu/ieggQhd/somofiruwinijopaxopi.pdfIn PDF document text
- https://molobaguzali.weebly.com/uploads/1/3/0/7/130739923/xoketajesomiseku.pdfIn PDF document text
- https://lepovomika.weebly.com/uploads/1/3/4/7/134701686/benadufudevatop-serofumurego-wekosup.pdfIn PDF document text
- https://site-1232858.mozfiles.com/files/1232858/30154634901.pdfIn PDF document text
- https://cdn.sqhk.co/xekemini/cjeVqhe/puzzly_puzzle_game_collection_apk.pdfIn PDF document text
- https://cdn.sqhk.co/lilomovetum/ic6jjhf/blood_pressure_medications_that_cause_constipation.pdfIn PDF document text
- https://bevowodawalejap.weebly.com/uploads/1/3/4/3/134363876/3bd20c51e4.pdfIn PDF document text
- https://cdn.sqhk.co/jivaduzar/1jiMwje/9607848496.pdfIn PDF document text
- https://site-1177569.mozfiles.com/files/1177569/giratina_origin_duo_raid_guide.pdfIn PDF document text
- https://sofifego.weebly.com/uploads/1/3/4/8/134899758/dagolurix.pdfIn PDF document text
- https://site-1175847.mozfiles.com/files/1175847/candy_crush_game_app_apk.pdfIn PDF document text
- https://cdn.sqhk.co/numanazolov/Y64OTia/rigigojunaj.pdfIn PDF document text
- https://cdn.sqhk.co/gejixoneku/lrgeQgz/carrom_game_online_for_free.pdfIn PDF document text
- https://zizopozuwugova.weebly.com/uploads/1/3/0/7/130775786/d6a575d5042.pdfIn PDF document text
- https://diwolusetu.weebly.com/uploads/1/3/5/2/135299278/5461867.pdfIn PDF document text
- https://cdn.sqhk.co/ribobujir/pih4gjd/loopback_adapter_rj45.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/babetafaperaxov/powavagufupepi.pdfIn PDF document text
- https://s3.amazonaws.com/midipes/guide_lulu_sp_s8.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e0d7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE0D7	4296 bytes
SHA-256: `f60a3994ec858961fbce628a25fb722b1ab2fe89636073bdb8437707bf1b2c5b`
`font_01_sfnt_off0000f04d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF04D	4960 bytes
SHA-256: `5f40c64c14aa8cc144d430a42d7f0b286b0f8df439fcc8e92516cf2ca7d51a57`
`font_02_sfnt_off0001013f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1013F	12252 bytes
SHA-256: `7f96803dca010112d91d4fbd08d11e1a6bd2a4cffd905f10cc4a7534f565480a`

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