PDF malware analysis — malicious · 8039de3b1c4ca768

MALICIOUS

PDF

75.1 KB Created: 2021-03-26 10:13:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: 4e2ca1c411b44060dd92a8b17d81a18c SHA-1: e79785753c942fb88e3e8104744cd601bc8be300 SHA-256: 8039de3b1c4ca768bb2f767292b2e069a50669bea74aede6f52adadcc88eee63

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a link farm, containing a large number of external links to various domains. The presence of a 'PDF_SEO_LINK_FARM' heuristic firing and numerous external URLs suggests an attempt to manipulate search engine rankings or direct users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or spam distribution vehicle.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://druttle.ru/123?utm_term=burp+proxy+certificate+android PDF link annotation
- https://cdn-cms.f-static.net/uploads/4455174/normal_604d8eda1a01b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4471985/normal_605055485a747.pdfIn PDF document text
- https://lupudeme.weebly.com/uploads/1/3/1/3/131378919/medawaj.pdfIn PDF document text
- https://famutogerene.weebly.com/uploads/1/3/4/6/134688643/zuziferale-nunixomuse-pabivoge-nikosoxenix.pdfIn PDF document text
- http://gagefiwirimat.medianewsonline.com/cbse_class_12_question_papers_2020.pdfIn PDF document text
- https://lipopujowojirew.weebly.com/uploads/1/3/1/4/131408954/e89c95d0a1f18b.pdfIn PDF document text
- https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/zutukekisevij.pdfIn PDF document text
- http://jugapus.sportsontheweb.net/mopisafusomoxal.pdfIn PDF document text
- https://misapunuzure.weebly.com/uploads/1/3/1/6/131606411/xoveki.pdfIn PDF document text
- https://najememate.weebly.com/uploads/1/3/4/8/134867979/900a53ab01.pdfIn PDF document text
- https://takadoturig.weebly.com/uploads/1/3/4/1/134108809/201656.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4390095/normal_600456b57a9b1.pdfIn PDF document text
- https://larulesa.weebly.com/uploads/1/3/4/7/134717423/zisabagetolamixik.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://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_8793f5e4f4304ee1a709078a1b1e2f22.pdf?index=trueIn PDF document text
- https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_3d110ed47d5d434b933553d6dd4a7cd5.pdf?index=trueIn PDF document text
- https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_bb092e19c7a04f5ea7ff2c1e4bd4e85f.pdf?index=trueIn PDF document text
- https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_51e0468978194e4987f80dc2a291d0ad.pdf?index=trueIn 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_off0000d944.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD944	5040 bytes
SHA-256: `43c392d3dd06c212e45f1f91f4c5d2ca21103c5025b7a3ad2378395f9160ed34`
`font_01_sfnt_off0000ea86.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA86	11212 bytes
SHA-256: `e181e2995fc20f7e71338438a45edbd8c096339238e6365732a9c46ca912a356`
`font_02_sfnt_off000110e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x110E2	4324 bytes
SHA-256: `cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34`

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