PDF malware analysis — malicious · 568dda36d72546f7

MALICIOUS

PDF

86.0 KB Created: 2021-03-12 21:42:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30

MD5: 1b26d735c709a46bb28c7945b5523dd0 SHA-1: 7e3f2f4bf138fa0be6c49b7b82aedfcafcf2360d SHA-256: 568dda36d72546f765e7617c857013197261e808f916d4aae6de4d09daa6dc39

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a common tactic for SEO manipulation and malware distribution. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a large number of external PDF links, suggesting an attempt to drive traffic to malicious or compromised sites. The presence of URLs like 'https://pelibifir.ru/123?utm_term=boney+m+songs++zip' further supports this, as they appear to be part of a link farm designed to attract users with search terms. The ClamAV detection and ML classifier also strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 5

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.
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://pelibifir.ru/123?utm_term=boney+m+songs++zip PDF link annotation
- https://cdn.sqhk.co/dusivubeleza/eYIJjgD/redskins_scores_2019.pdfIn PDF document text
- https://pekixozere.weebly.com/uploads/1/3/5/3/135397988/e055ceda.pdfIn PDF document text
- https://cdn.sqhk.co/riroxale/djajjkq/spanish_learning_in_english.pdfIn PDF document text
- https://cdn.sqhk.co/fipimomozuk/hImiggg/pacify_her_melanie_martinez_meaning.pdfIn PDF document text
- https://regafuraseni.weebly.com/uploads/1/3/4/6/134663643/4360267.pdfIn PDF document text
- https://kabugumaka.weebly.com/uploads/1/3/6/0/136099465/b5ca34a0.pdfIn PDF document text
- https://miburinu.weebly.com/uploads/1/3/4/4/134464577/8773580.pdfIn PDF document text
- https://delupizamima.weebly.com/uploads/1/3/4/5/134578079/jizivapasixusobedut.pdfIn PDF document text
- http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/faluzotixupi/14113950168.pdfIn PDF document text
- https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_613e708c12234a9d93ee53301f8af3bd.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/dikobepibelun/26425214339.pdfIn PDF document text
- http://todojenosefotaz.epizy.com/asterisk_war_op.pdfIn PDF document text
- https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_583fd84b5c364520b45d1dee5caea57e.pdf?index=trueIn PDF document text
- https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_f28333f5beb04c1192f0805f79946b7f.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/rovuweraja/which_brand_of_instant_water_heater_is_best_in_singapore.pdfIn PDF document text
- https://s3.amazonaws.com/novifamigot/sepujawimorefolemotulig.pdfIn PDF document text
- https://s3.amazonaws.com/ribowexulo/ragozotogelozaf.pdfIn PDF document text
- http://bukusisege.rf.gd/candida_tratamiento.pdfIn PDF document text
- https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_6d65a5b0fe9649d09867cba23afedaf8.pdf?index=trueIn PDF document text
- http://vuripuwap.epizy.com/major_barbara_brief_summary.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://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_005_off000121f2.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x121F2	22640 bytes
SHA-256: `23668cc3808a4dbae035c65c71ce42154d523ffdfd6f2587cf0c96db6de9c16d`
`font_00_sfnt_off0000dfad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDFAD	1820 bytes
SHA-256: `b0293a62ed1c1150c2da1effc6b0836f674c2858cfbc81e99fa7bac3697568d7`
`font_01_sfnt_off0000e889.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE889	5004 bytes
SHA-256: `4216c2af70044015968957978ceddc6274cae9645b5da841152aed38349dd2d4`
`font_02_sfnt_off0000f99e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF99E	11956 bytes
SHA-256: `c0bbf726b453ae8650b3725d25f41014a2da0da351f60aa4fdfd4cc7abaea0fa`

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