PDF malware analysis — malicious · 59a432b129553f53

MALICIOUS

PDF

81.1 KB Created: 2021-05-25 20:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23

MD5: 2bc3b0b8bd01b1f9ec9a3d44214f185a SHA-1: 9ad22901ba92613d21783ed27cb38b366d1c68c5 SHA-256: 59a432b129553f53a7c345e2d86065dd63b7f3b1e38f0f7e241db0f95489b58f

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious by ML models and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation designed to redirect users to malicious content. The document body is heavily obfuscated and appears to contain garbled text, but the presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly suggest the primary function is to drive traffic to other 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://bologen.ru/strik?utm_term=what+is+a+closed+syllable+example PDF link annotation
- https://static.s123-cdn-static.com/uploads/4388612/normal_60040fce2fe38.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4418001/normal_604345c1ec5fb.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4529281/normal_6066e66adb1bf.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4402932/normal_602e052c5e908.pdfIn PDF document text
- https://mafetoga.weebly.com/uploads/1/3/0/8/130874134/3391710.pdfIn PDF document text
- https://kowagazobavov.weebly.com/uploads/1/3/0/8/130874359/902542.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4379851/normal_6036b2490e2a1.pdfIn PDF document text
- https://tiwamufeg.weebly.com/uploads/1/3/1/8/131871705/duniwotuwo.pdfIn PDF document text
- https://vuguzunorofina.weebly.com/uploads/1/3/4/3/134322364/369a32bc.pdfIn PDF document text
- https://wobozosexeje.weebly.com/uploads/1/3/0/8/130814788/baxuwuwilotonex_tibenutunakol_fekapape_bovowoxulusod.pdfIn PDF document text
- https://wafumaxa.weebly.com/uploads/1/3/5/4/135400811/8485155.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4420747/normal_5ffa6236e0aaf.pdfIn PDF document text
- https://gogekelonirivi.weebly.com/uploads/1/3/4/4/134438841/7062861.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4464710/normal_600e78699e246.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4446924/normal_5fe85cb001f56.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4415782/normal_60246a1d6e547.pdfIn PDF document text
- https://widebevuzolari.weebly.com/uploads/1/3/4/7/134705185/duxasenopupe-wujizinokuxok-morodedeladidi.pdfIn PDF document text
- https://tujulita.weebly.com/uploads/1/3/4/6/134687611/tifumiwixewep_voduzagavoses_nawevoxinubo.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4377098/normal_6007e0cf11951.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://uploads.strikinglycdn.com/files/792d0cb7-ebca-4718-af26-d87faed398ca/mixafavaziruzug.pdfIn PDF document text
- https://s3.amazonaws.com/tumuzu/where_did_the_name_tears_for_fears_come_from.pdfIn PDF document text
- https://s3.amazonaws.com/zagubip/jelipemageke.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/9180e173-dbd7-4f00-a241-7723466c590c/71106592206.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_off0000f148.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF148	5224 bytes
SHA-256: `804d8ec923be45a942c0ea83fb910b0d25da7941289230e8a42e91394e4b57c2`
`font_01_sfnt_off0001031d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1031D	11056 bytes
SHA-256: `e260b4f6a19145850e242e3be10f7ed1054f4f3ff5c1446cddb8e3b25eace815`
`font_02_sfnt_off000128a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128A1	4324 bytes
SHA-256: `05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176`

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