PDF malware analysis — malicious · ab28b8fd33c8af47

MALICIOUS

PDF

78.2 KB Created: 2021-02-22 02:22:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17

MD5: 12b0db5a886344c1f0ec778054c0aaf8 SHA-1: d37d94c1c5e0f734270beb7aee4a1b016a6ebd6d SHA-256: ab28b8fd33c8af47b4cdcb3aeb26fb251f7a2c04707bb88523e08a9f137e9d6d

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 domains and Weebly-hosted PDFs, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious document designed to lure users to potentially harmful content.

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
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://jacksth.ru/123?utm_term=us+history+chapter+17+18+19+test PDF link annotation
- https://kobawepa.weebly.com/uploads/1/3/1/0/131070010/bijitemuku_xudus.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4468550/normal_6032e1545ccc8.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4381980/normal_602f147428662.pdfIn PDF document text
- https://dixotusokor.weebly.com/uploads/1/3/0/9/130968976/tubupa-nopoberim.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4426269/normal_5fe83840a5abc.pdfIn PDF document text
- https://pesadosopovito.weebly.com/uploads/1/3/4/2/134235692/556747.pdfIn PDF document text
- https://voranafirodibug.weebly.com/uploads/1/3/2/6/132696030/vorigubenim.pdfIn PDF document text
- https://lekikibobasiva.weebly.com/uploads/1/3/5/3/135350768/vakoruparujir_nijanev_sewote_dodit.pdfIn PDF document text
- https://vurerabekude.weebly.com/uploads/1/3/4/4/134493837/dagodupu-duwidulobora-kopoka.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4412158/normal_5fd6610b57a97.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4454820/normal_601bf96a74602.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4458635/normal_5fe4b22ee5c5b.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4450351/normal_5fcaecb771a4f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4446398/normal_5fd888cb1f044.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4445541/normal_5ff333585f850.pdfIn PDF document text
- https://wufovepujiz.weebly.com/uploads/1/3/0/7/130775368/7f2734a.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4487918/normal_5fe4e3ed2b9a7.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4458421/normal_5ff273951799b.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dbf9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBF9	5564 bytes
SHA-256: `dc20aab276a05748fc9c7b7729f09eac67294294e8c2a8d638306a8cc8363cf0`
`font_01_sfnt_off0000eef7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEEF7	11068 bytes
SHA-256: `9f2a193aa98d7f5bf6aa82911ba40413bb8dc8d9390ace8e389554ad6aea009d`
`font_02_sfnt_off000114ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114CE	16204 bytes
SHA-256: `541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501`

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