PDF malware analysis — malicious · 722b0caefe96c6f3

MALICIOUS

PDF

74.5 KB Created: 2021-02-15 04:28:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12

MD5: 85ad31f8609f53f417638be78af94d9a SHA-1: 25552a67500c8483b0d70148a7d850ae11068588 SHA-256: 722b0caefe96c6f3297caac769ffcc25139152329e87b3ed92752d22201e0d19

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting services, characteristic of a link farm or SEO spam operation. The document body, though partially corrupted, suggests a lure related to 'research questions', likely to disguise the malicious nature of the embedded links.

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
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://seumenha.ru/123?utm_term=how+to+develop+research+questions PDF link annotation
- https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/fusej-fozemirijilelo-dorawopojem.pdfIn PDF document text
- https://zogadinarele.weebly.com/uploads/1/3/1/4/131409244/lanamidusatenuj.pdfIn PDF document text
- https://cdn.sqhk.co/ferorigife/arTjihd/kejolinasu.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4368982/normal_5fe942767701b.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4401983/normal_5fcbdf997c591.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4458622/normal_5fd76eac0ec93.pdfIn PDF document text
- https://cdn.sqhk.co/tegiriwepaj/15VARhg/tofaxeketegomilunukajod.pdfIn PDF document text
- https://cdn.sqhk.co/mibuxedufexi/YihjfNw/82445914773.pdfIn PDF document text
- https://cdn.sqhk.co/zibepidok/d4jaLji/84130850663.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4412382/normal_6007a9076d102.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4409997/normal_601b902694137.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4377114/normal_60046ada7b67f.pdfIn PDF document text
- https://tijozamuworibop.weebly.com/uploads/1/3/1/6/131607374/641f8a8fed.pdfIn PDF document text
- https://nozifudofo.weebly.com/uploads/1/3/2/6/132681081/ea98a53e7.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4496193/normal_5ffbd93cbeb89.pdfIn PDF document text
- https://wuwiragirek.weebly.com/uploads/1/3/0/8/130874366/ledaxabipamefamen.pdfIn PDF document text
- https://bukodebavuv.weebly.com/uploads/1/3/4/6/134657655/fikenuk_kigasusafaxaze.pdfIn PDF document text
- https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/binevapu-woxuvab.pdfIn PDF document text
- https://cdn.sqhk.co/podidiwi/xDChdhj/food_wars_manga_ending_vs_anime.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_off0000d94d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD94D	5284 bytes
SHA-256: `10290f0defbe65c15c915af330c27dbc59348f87cca7cc4c5a394d8cc02e4562`
`font_01_sfnt_off0000eb4e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEB4E	10356 bytes
SHA-256: `821d5f7062946a185854c32aac393394e5ab5b9333ed060a05a676fd684814c6`
`font_02_sfnt_off00010e90.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10E90	4324 bytes
SHA-256: `0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333`

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