PDF malware analysis — malicious · 1fb4cb74f12c5eab

MALICIOUS

PDF

82.1 KB Created: 2021-09-11 17:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: aa81548adccc866d1edc38b083e9b929 SHA-1: 63064a564e643ae60e0452bbe18ab5bf9e6393ce SHA-256: 1fb4cb74f12c5eab89010854dc56cf65e857da062ff066e5a6be4c8f08456a08

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be disposable and used in a link farm configuration. The PDF structure and heuristic firings suggest an attempt to lure users to external, potentially malicious, resources.

Machine Learning

Nyx PDF Classifier malicious score 0.9917

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 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 http://nattuvaartha.com/assets/ckfinder/core/connector/php/uploads/files/jutuxodekiwo.pdf In PDF document text
- https://www.ojchamber.com/ckfinder/userfiles/files/kewedanomuse.pdfIn PDF document text
- http://citra.cl/userfiles/file/geterazigefifuwa.pdfIn PDF document text
- http://mamnonkitty.com/webroot/img/posts/files/wopeludiwuxoguva.pdfIn PDF document text
- https://chptravel.ir/data/file/tilowutanumedo.pdfIn PDF document text
- https://hfbee.tw/upload/ckfinder_temp/files/20210901122744.pdfIn PDF document text
- https://moulindelarroque.com/userfiles/file/tupugotexu.pdfIn PDF document text
- http://www.amedna.com/userfiles/files/fozazogitibu.pdfIn PDF document text
- http://yaqeen-eg.com/userfiles/file/kuxoviwubupodowexumugepig.pdfIn PDF document text
- https://aymfly.com/aym_image/files/50755060616.pdfIn PDF document text
- http://gesundezellen.de/neu/userfiles/file/47989405990.pdfIn PDF document text
- http://affordableadobe.com/ckfinder/userfiles/files/23528687271.pdfIn PDF document text
- http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ccc051149---famaluwuzenedufix.pdfIn PDF document text
- http://munnartourism.com/uploads/file/33853507434.pdfIn PDF document text
- https://huuphongplastic.vn/uploads/images/files/nexaregadexosedosab.pdfIn PDF document text
- https://majubesar.net/contents/files/fiwanoboxogojupujawezev.pdfIn PDF document text
- http://andrelandberg.com/userfiles/file/bivojirijesidiwazak.pdfIn PDF document text
- http://batterseataxi.com/survey/userfiles/files/medajazetezulenep.pdfIn PDF document text
- http://suamayin.biz/userfiles/file/83820790975.pdfIn PDF document text
- http://handsonmontessoripk.com/userfiles/files/gosanevarerosa.pdfIn PDF document text
- http://www.hkrns.org.hk/ckfinder/userfiles/files/33263329306.pdfIn PDF document text
- https://alakharia.com/public_html/userfiles/file/sosunep.pdfIn PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161366fe25b52d---kafebazej.pdfIn PDF document text
- http://yeditepegumruk.com/userfiles/45355382271.pdfIn PDF document text
- http://tizianaiberti.it/userfiles/files/sodaxud.pdfIn PDF document text
- http://orel-trinity.ru/sites/default/files/file/35068471122.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+set+default+camera+app+androidPDF link annotation
- 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000da0a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA0A	10956 bytes
SHA-256: `4b265c8d12b29f44ccfa5ccb716f3b5712952dba744dfde78accf51fdf748158`
`font_01_sfnt_off0000f374.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF374	17844 bytes
SHA-256: `3f46c237acba5f59b728d512fa44475c4fe7c793c83cdea51a7692fd0df6ae53`
`font_02_sfnt_off000121f5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121F5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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