PDF malware analysis — malicious · 08b716e5665ef9ea

MALICIOUS

PDF

80.5 KB Created: 2021-02-27 22:36:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18

MD5: ed9d2dab2e07742de6313674e169292d SHA-1: 175d31d7c9022216812a7c98453dfdc3c8637ecd SHA-256: 08b716e5665ef9ea8e3e00453d426a049ed7bccf3a0d9c7fe49d376ad070fc3a

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which point to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains keywords related to free downloads, likely serving as a lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=sql+server+books+free+download+pdf PDF link annotation
- http://paganel.world/acrylic_sheet_cut_to_size_b_qvx1b2.pdfIn PDF document text
- http://bostpolamos.site/bengali_prosenjit_video_song4bhbg.pdfIn PDF document text
- https://xibixijuli.weebly.com/uploads/1/3/5/3/135399677/6457740.pdfIn PDF document text
- https://cdn.sqhk.co/panazomuv/hdgeKhj/puffin_web_browser_pro_mod.pdfIn PDF document text
- https://jovigazever.weebly.com/uploads/1/3/1/6/131637362/7624756.pdfIn PDF document text
- https://fowowudajij.weebly.com/uploads/1/3/5/3/135312379/gilomeduw.pdfIn PDF document text
- https://cdn.sqhk.co/jozojijejip/RfCgejb/dujusota.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4471683/normal_600ce3bc3c5db.pdfIn PDF document text
- http://naturka.space/ancient_chinese_religionsgd9j.pdfIn PDF document text
- http://nigma24invest.online/63915913418arjlt.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4467036/normal_5fc72460585e9.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4461751/normal_60126c2fbd838.pdfIn PDF document text
- https://vizifota.weebly.com/uploads/1/3/0/9/130969876/rugopo.pdfIn PDF document text
- https://kofosobi.weebly.com/uploads/1/3/4/5/134528260/daxatezuwur.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4420020/normal_60368a25e0383.pdfIn PDF document text
- https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/savabus_sinazadij_kesojup.pdfIn PDF document text
- https://cdn.sqhk.co/zirigajer/hbo3gfK/19375057409.pdfIn PDF document text
- https://zikixitifo.weebly.com/uploads/1/3/4/8/134897390/555142.pdfIn PDF document text
- https://xijexarara.weebly.com/uploads/1/3/4/0/134017378/dimetuxizuvogadekotu.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000db25.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDB25	5620 bytes
SHA-256: `8a58203d6e8489315f51411a69ddd505a2c598fc2612aaa0549a861e88e12d3c`
`font_01_sfnt_off0000ee5d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE5D	1936 bytes
SHA-256: `84daf345e21b08075a6e329eeacb0a13a0447ddcc3efc64e98a9a4ab9c6a9d9d`
`font_02_sfnt_off0000f79e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF79E	10712 bytes
SHA-256: `ce2e47daacfbcc12999d72be6cb4275ecc6972febf0e6bd7f3422933ab9176ce`
`font_03_sfnt_off00011c47.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11C47	16480 bytes
SHA-256: `11794893a91df9a42355b82e9811daecad23ed47eec49ad8734d4dfb88c09fe9`

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