PDF malware analysis — malicious · b468d588d1c3a303

MALICIOUS

PDF

79.7 KB Created: 2021-04-23 08:40:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13

MD5: 5d806a057c779e5dc415d01a61e1c5f2 SHA-1: dcc1d65fc7d597f0ade7a67b1e8dd7e26542b1b8 SHA-256: b468d588d1c3a303b8236433e79fe98393e7ff7bee004c69289f3475eb34d485

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, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

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://jacksth.ru/strik?utm_term=chess+openings+for+beginners+book+pdf PDF link annotation
- http://pumeputokamodo.22web.org/95878416639.pdfIn PDF document text
- http://bizawojumufa.22web.org/xamexiriwixaji.pdfIn PDF document text
- https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/movejixibozazamupix.pdfIn PDF document text
- http://helpcenterbusiness.xyz/87139237988uqwlx.pdfIn PDF document text
- http://lessonsonline.site/gulavirudisuleleticlkyd.pdfIn PDF document text
- http://kivepisumen.22web.org/ataxia_cerebelar_fisiopatologia.pdfIn PDF document text
- https://pukiroxe.weebly.com/uploads/1/3/2/3/132303351/jepes.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://19972ee8-34f0-4900-8009-9f590161cd02.filesusr.com/ugd/64db51_46b6eff695a34b3dbee7b9f62daf27ca.pdf?index=trueIn PDF document text
- http://makunixiwelukiz.rf.gd/the_shack_full_movie_watch_online_free.pdfIn PDF document text
- https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_3e32206ce9124ab89e791f7be48675b7.pdf?index=trueIn PDF document text
- http://monuwuwotivonil.epizy.com/86053483614.pdfIn PDF document text
- http://tijasewe.rf.gd/how_to_teach_finding_the_main_idea.pdfIn PDF document text
- https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_a10e2c01a3ff4adb812eaca83e478843.pdf?index=trueIn PDF document text
- https://1c2b20db-dbe1-4299-b4c0-f67d595d3b6c.filesusr.com/ugd/e71423_faad64d6af754df5bb9550f92db1d2c0.pdf?index=trueIn PDF document text
- https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_0d1034a0737a4a9dbb2c79e6f92f96bf.pdf?index=trueIn PDF document text
- https://73a1781f-5c9f-4c76-8a11-a8e8c44f336a.filesusr.com/ugd/d9f7b5_811d2fc096e440bca668ec160e667168.pdf?index=trueIn PDF document text
- http://tavewafed.epizy.com/39921039510.pdfIn PDF document text
- https://08b4a39d-fa16-4eaa-91be-ae90003cacb9.filesusr.com/ugd/237bf7_bcd12cccd6954d5fb4a7ea201df256df.pdf?index=trueIn PDF document text
- https://a519209a-2b0a-481f-9fe9-460c873bdc80.filesusr.com/ugd/270e53_30d6b979b0924ef798e8268ac00037cf.pdf?index=trueIn 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_off0000eaba.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEABA	3472 bytes
SHA-256: `e1d1da3111a2359ea22c12791285e5a29b35cdb33343134f8cbe1bce33cae770`
`font_01_sfnt_off0000f715.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF715	5172 bytes
SHA-256: `0196d772b37df480ee455700033cf3182caa77648dd6d6b95d86bd79bd7f5b6c`
`font_02_sfnt_off000108a1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x108A1	11448 bytes
SHA-256: `06ad2f5731e6e2185572671789b962f92903dd5e25d71f8701f8fd47e9a44f13`

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