PDF malware analysis — malicious · 0ca32bdb0c202962

MALICIOUS

PDF

79.5 KB Created: 2021-05-18 11:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16

MD5: 5d67152487cac1c2d74e32df771e2d2b SHA-1: dc5a1303002a1484349e8f3bc947a0b7a542e8ec SHA-256: 0ca32bdb0c202962d1d4a717f64752b4b3d6ca7fce45e6fbcafde6a626742d39

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it's designed to redirect users to malicious sites.

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.
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.
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://bologen.ru/strik?utm_term=convert+word+to+pdf+download+windows+7 PDF link annotation
- https://cdn-cms.f-static.net/uploads/4408009/normal_601acdf72a293.pdfIn PDF document text
- https://buxufuniwa.weebly.com/uploads/1/3/4/7/134717035/2800695.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4484995/normal_601ac43730965.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4469828/normal_60228cccbeac9.pdfIn PDF document text
- https://bamufikike.weebly.com/uploads/1/3/1/6/131606241/292f785e0.pdfIn PDF document text
- https://sadewurepoko.weebly.com/uploads/1/3/0/7/130776460/885ccdb.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4410976/normal_601be6a561e8d.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4452863/normal_605bf6c43af70.pdfIn PDF document text
- https://jakineporop.weebly.com/uploads/1/3/5/3/135302356/5582640.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4418747/normal_60677605c82d1.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4403807/normal_6050a6ef9a56e.pdfIn PDF document text
- https://wonozonozosog.weebly.com/uploads/1/3/1/3/131398184/xovubi.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4373297/normal_5fe78bf6534d8.pdfIn PDF document text
- https://powujuraw.weebly.com/uploads/1/3/5/3/135321569/de25f024d3072e.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4487187/normal_601ba33a1490d.pdfIn PDF document text
- https://wobakasufafe.weebly.com/uploads/1/3/2/6/132682589/roxogatef-sisejo-fadukex.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/wegugus/react-_native-_push-_notification_android_example.pdfIn PDF document text
- http://kepijemimubu.rf.gd/26798556068.pdfIn PDF document text
- http://dotosetebokiru.rf.gd/boyfriend_application_form.pdfIn PDF document text
- https://s3.amazonaws.com/jamuluvuvava/86212291319.pdfIn PDF document text
- http://vaxavapokun.rf.gd/pikomugazibugizabudija.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_off0000ec83.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC83	5080 bytes
SHA-256: `7a1ae7344784464fc9949d4a919e5a7e4060df59968cb9fc2b39c018aaf91933`
`font_01_sfnt_off0000fdf1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFDF1	10724 bytes
SHA-256: `389819850c391c978f270b88288f31df2a0bdaba38654135f8e887cd7240db92`
`font_02_sfnt_off00012261.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12261	4324 bytes
SHA-256: `a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f`

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