PDF malware analysis — malicious · 0875fb002bb7b4c8

MALICIOUS

PDF

78.1 KB Created: 2021-02-20 01:16:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20

MD5: c8e65b7fb25665bc0af4088d1bfe6f3e SHA-1: a99cbcaf74975e32bc391430cb1c04c65132c13a SHA-256: 0875fb002bb7b4c81d01f1b55bad496b6563dfa93cdc6694ed6f7a3d0b2ec6ff

244 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links pointing to various disposable domains and redirectors, suggesting a link farm designed to distribute malicious content or conduct phishing. The primary URL, 'https://crophysi.ru/strik?utm_term=how+to+fourier+transform+in+excel', appears to be a redirector to further malicious sites.

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://crophysi.ru/strik?utm_term=how+to+fourier+transform+in+excel In PDF document text
- https://cdn.sqhk.co/mapetidul/OkkBbgg/xanovajomivuledejob.pdfIn PDF document text
- https://cdn.sqhk.co/pugalaleluti/haNiiMm/zezavudonagibawemebadoxij.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4470524/normal_5ffa846c36093.pdfIn PDF document text
- https://cdn.sqhk.co/pulafefer/duxNbe0/rise_of_kingdoms_commander_pairing_guide.pdfIn PDF document text
- http://botojagi.iblogger.org/gapozutafibeza.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4380530/normal_601fe572be377.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366308/normal_6014144bb7d4b.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4374519/normal_602d02c526c47.pdfIn PDF document text
- https://tiwirekofer.weebly.com/uploads/1/3/5/3/135314588/9263579.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4369904/normal_5ff952a860116.pdfIn PDF document text
- https://wexabegolorumad.weebly.com/uploads/1/3/4/3/134351445/b21e1a5f.pdfIn PDF document text
- http://pemojubeku.iblogger.org/dk_animal_encyclopedia_free.pdfIn PDF document text
- https://cdn.sqhk.co/gilevetu/hbFm4Ln/92837674325.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4481408/normal_5fdb01969b3c7.pdfIn PDF document text
- https://mavulirapiba.weebly.com/uploads/1/3/4/7/134741644/00c8d1a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4491723/normal_6014c4c3a6da3.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://vedogitunenaki.rf.gd/william_gibson_neuromancer_quotes.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_off0000e77e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE77E	5032 bytes
SHA-256: `64b8804c5a894693b643e30e00838641b35b4e43b4495a652fdb397b142c1244`
`font_01_sfnt_off0000f88f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF88F	10568 bytes
SHA-256: `46aecccf8c16158ed6b674029f070030827c14c6ab54ab924a53432dfe58fa2a`
`font_02_sfnt_off00011cc2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11CC2	4324 bytes
SHA-256: `9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2`

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