PDF malware analysis — malicious · c23c4059e5c5d018

MALICIOUS

PDF

71.5 KB Created: 2021-03-18 02:29:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13

MD5: c759bc7e4bcf5c250ec889ffca624994 SHA-1: 0ce25843a46f05b84f4f31d8200c370e79d4bae1 SHA-256: c23c4059e5c5d018cdc184078186191f6efb0bb163f18ce825ef928ca6a09612

194 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 7

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://baarspo.ru/wix?keyword=organs+worksheet+ks3 PDF link annotation
- https://jejaparax.weebly.com/uploads/1/3/5/3/135332208/c8bab253992f.pdfIn PDF document text
- https://cdn.sqhk.co/tevotapomow/hjhjhRl/wunderground_buzzards_bay_marine_forecast.pdfIn PDF document text
- http://nozatisesufi.scienceontheweb.net/76911351303.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4459636/normal_5fe988523d425.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4389816/normal_60347c7be5863.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4419423/normal_604d0de889128.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4446915/normal_603275c139793.pdfIn PDF document text
- https://ritojajugub.weebly.com/uploads/1/3/5/9/135984917/kajiwozezetuwu-gajojetezox.pdfIn PDF document text
- http://pifadopagel.scienceontheweb.net/6787025191.pdfIn PDF document text
- https://cdn.sqhk.co/ravunovibuxi/L2jigfG/37410202789.pdfIn PDF document text
- https://memuwumobodedo.weebly.com/uploads/1/3/5/9/135974490/515e54dcaf.pdfIn PDF document text
- https://naxejewosusubet.weebly.com/uploads/1/3/4/7/134749601/12ed245.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4477638/normal_601469e3bc401.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4451230/normal_601f0ce1910d1.pdfIn PDF document text
- http://lobabinuladeri.medianewsonline.com/how_to_fix_water_leak_in_kenmore_refrigerator.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4475580/normal_604e0648128c6.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/sajezife/wegovagin.pdfIn PDF document text
- https://s3.amazonaws.com/rogugagatuf/95923431121.pdfIn PDF document text
- http://kubowulurarekij.myartsonline.com/katogizonusamu.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000c7ae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC7AE	5264 bytes
SHA-256: `7f8e489f815acf3602ca68b21925e39b10c5d68e1a71e140a5dd6de961a4fed7`
`font_01_sfnt_off0000d9a6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9A6	10052 bytes
SHA-256: `8aa1a9cc0346cc372fe1adf8ce3de8415af250ac732d2ad605cbf74453432f5d`
`font_02_sfnt_off0000fc31.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC31	16088 bytes
SHA-256: `ba49a359edda73fb432b2118eee43e8681603f6c6f845ef214af08c3a95321db`

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