PDF malware analysis — malicious · 6141419ecafa01ee

MALICIOUS

PDF

81.7 KB Created: 2021-02-02 19:19:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31

MD5: d099c752e8cd7249fb28f47746786ec4 SHA-1: 7a030a101f8b515ea04e78e0f45d26ba76a6ba24 SHA-256: 6141419ecafa01ee30a419faf214e34b1315c03bf225732c596094266aa9b1e6

244 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of embedded URLs, many pointing to disposable hosting services, indicating it functions as a link farm. One critical heuristic specifically flagged it as a redirector link to known malicious infrastructure. The document body, though heavily obfuscated, contains references to 'vcredist 2015 64 bit', suggesting a potential lure for users seeking software downloads, which are then redirected to malicious sites.

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
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://crophysi.ru/aws?utm_term=vcredist+2015+64+bit In PDF document text
- https://cdn.sqhk.co/vumorumuvogi/4JuqgeZ/zapudigan.pdfIn PDF document text
- https://cdn.sqhk.co/fazituku/ejiPhfe/16473198523.pdfIn PDF document text
- https://cdn.sqhk.co/tuxonewebuke/hhhjYM4/4919780217.pdfIn PDF document text
- https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/kusipik.pdfIn PDF document text
- https://cdn.sqhk.co/mofosalamo/f1YihuW/nenovodesa.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366956/normal_5fd7c1ad96a67.pdfIn PDF document text
- https://teligodinawam.weebly.com/uploads/1/3/4/4/134457670/dudavaj_vepatin_xajifemejasanud_mirebuza.pdfIn PDF document text
- https://metekazup.weebly.com/uploads/1/3/2/8/132815755/1dacffa9d.pdfIn PDF document text
- https://cdn.sqhk.co/pasivuzuke/hO4sHjd/kujumitosepakivesigo.pdfIn PDF document text
- https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/1f2f9590d41.pdfIn PDF document text
- https://xoxekoxezugox.weebly.com/uploads/1/3/0/7/130738790/b0b7a9f2e4.pdfIn PDF document text
- https://lofidebonejiniz.weebly.com/uploads/1/3/5/3/135334880/189325.pdfIn PDF document text
- https://bilujadaju.weebly.com/uploads/1/3/4/7/134772480/mawamufe.pdfIn PDF document text
- https://fobepuwup.weebly.com/uploads/1/3/1/0/131070598/totepopulifun.pdfIn PDF document text
- https://cdn.sqhk.co/kitujesijak/hgwjjih/22424973053.pdfIn PDF document text
- https://vikakexotokipo.weebly.com/uploads/1/3/0/9/130969200/4b8086876fd.pdfIn PDF document text
- https://nenejiremox.weebly.com/uploads/1/3/0/9/130969141/010dc0225.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
- 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_off0000f516.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF516	5060 bytes
SHA-256: `ebb9bc53b9820f6a77161dcbff16beec4e11402804da036bcdd1552232a14f70`
`font_01_sfnt_off0001066b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1066B	10800 bytes
SHA-256: `b3be2530c413b26e393d53cc79d22bd905f2ffdac4dc3488807c9955737fdeca`
`font_02_sfnt_off00012b84.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12B84	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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