PDF malware analysis — malicious · 8d8da4ff2f39a56f

MALICIOUS

PDF

85.2 KB Created: 2021-05-31 15:40:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: 1bef13cd257dc3ebdf6b73007486d5ef SHA-1: 1038f2290705a038d11b59e3b31c1eabdb4f70e7 SHA-256: 8d8da4ff2f39a56f346a9608855e7ec8b005772645ebdd132d0e3e01d01b156d

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 hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

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://fokemale.ru/123?utm_term=how+to+format+json+code+in+notepad%252B%252B PDF link annotation
- https://nikavazoz.weebly.com/uploads/1/3/1/4/131452929/kenirufejifuzoguvo.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4446925/normal_60615419f021c.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4381964/normal_603b456ed6a3f.pdfIn PDF document text
- https://zenisitidijo.weebly.com/uploads/1/3/4/3/134309999/kawiponun.pdfIn PDF document text
- https://gigojajalul.weebly.com/uploads/1/3/4/3/134320096/lubinasateson_sunulil_narupilirola_xakos.pdfIn PDF document text
- https://rogetaguw.weebly.com/uploads/1/3/1/4/131407632/4009619.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4416495/normal_601d93b1589a5.pdfIn PDF document text
- https://kosazuritejozu.weebly.com/uploads/1/3/0/8/130874521/0b30cc8b1.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369782/normal_602003b102b7a.pdfIn PDF document text
- https://gavabedaxi.weebly.com/uploads/1/3/4/9/134902957/415f9.pdfIn PDF document text
- https://zasuzepomuban.weebly.com/uploads/1/3/4/6/134627511/8083152.pdfIn PDF document text
- https://saxipapes.weebly.com/uploads/1/3/0/7/130738636/8087740.pdfIn PDF document text
- https://temadugebunexi.weebly.com/uploads/1/3/1/8/131871621/kegizitotapujotedub.pdfIn PDF document text
- https://majizozu.weebly.com/uploads/1/3/4/5/134598595/796f698f8f.pdfIn PDF document text
- https://xemizumelisiga.weebly.com/uploads/1/3/1/8/131856695/d35c5833e755e33.pdfIn PDF document text
- https://xebivonejawaf.weebly.com/uploads/1/3/4/0/134096192/jetileteju_vokuzogidume_fujagizodode.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4386334/normal_5fdb648e5ea4f.pdfIn PDF document text
- https://static.s123-cdn-static-d.com/uploads/4381751/normal_60b4b04e973e7.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/91442cc2-8615-41d5-87a4-8e126efe6017/5727652771.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/3da80fd2-bbee-4e2c-bd1b-d6397fa2176b/why_is_nikki_giovanni_important.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/3ab1baa1-05a5-4b2a-bd20-3037ad657767/setup_maven_home_in_intellij.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/7fad7695-4fd1-494e-8c42-30c05be04251/55286222016.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_off0000ee43.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE43	5400 bytes
SHA-256: `5d969be30fca3b72d01ae26f489c92a0dd51ebaca611361c2188894181a6b69d`
`font_01_sfnt_off00010097.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10097	1644 bytes
SHA-256: `f51e468cad89be37a6377395ae51ea56b7319975502e3545cb67ca15c9b82b03`
`font_02_sfnt_off000108f4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108F4	11548 bytes
SHA-256: `4648f939b4172b652a55058f1472234b3c51ce94eff4cf02976a72a0a63cf7f8`
`font_03_sfnt_off00013082.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13082	16036 bytes
SHA-256: `9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940`

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