PDF malware analysis — malicious · e49c6aa97188126c

MALICIOUS

PDF

82.9 KB Created: 2021-09-24 02:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: bfb202c40974cd77f148915a8b99a8f1 SHA-1: 1b7ac131bbacb46fc6daa80546f3eeef579ca15b SHA-256: e49c6aa97188126cc6c32003f0cc14f3ce0d2b009df44bca8d7b41c75fc4e56d

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs and a heuristic flagging it as a link farm on disposable hosting suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

Nyx PDF Classifier malicious score 0.9960

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 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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://catamma.ru/uplcv?utm_term=minecraft+pocket+edition+game+apk PDF link annotation
- http://etalentlink.com/uploadfile/file///2021090920502883.pdfIn PDF document text
- http://www.mostenpo.jp/userfiles/files/nupebigasurefexi.pdfIn PDF document text
- http://agedwedfjtj.pretty-match.com/upload/files/bujoluxeluk.pdfIn PDF document text
- http://hueide.com/upload/files/modusasa.pdfIn PDF document text
- https://assignmentmart.com/ckfinder/userfiles/files/8170179682.pdfIn PDF document text
- http://www.addvanceo.info/userfiles/files/3553322642.pdfIn PDF document text
- https://asthasupermarket.com/userfiles/file/81978258799.pdfIn PDF document text
- http://mastervin.ru/files/file/fipojekuxupikave.pdfIn PDF document text
- https://dmshospital.com/mm_engg/files/razesatumuxisusodubuj.pdfIn PDF document text
- https://almavilag.hu/files/files/40170688650.pdfIn PDF document text
- https://bliznacite.dvsportbg.com/files/51703574383.pdfIn PDF document text
- https://ceccarbotosani.ro/userfiles/file/99662284234.pdfIn PDF document text
- https://specializedfacilitymgt.com/public_html/userfiles/file/pidumodafovafawodegireka.pdfIn PDF document text
- http://africalegal.nl/userfiles/file/rovotabumajoninazutege.pdfIn PDF document text
- http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16146adf3dd1d4---35190820158.pdfIn PDF document text
- https://harmony.im/userfiles/file/20880902748.pdfIn PDF document text
- http://velomagazin.hu/UserFiles/file/supudotarasamowemaw.pdfIn PDF document text
- https://amatnieks.com/pictures/image/resokedubavagolulop.pdfIn PDF document text
- http://capesociety.ca/uploads/files/39794836162.pdfIn PDF document text
- https://mepho.hu/ckfinder/userfiles/files/kilomibuwo.pdfIn PDF document text
- http://energywork.pl/userfiles/file/mososonodudewekawewonobo.pdfIn PDF document text
- https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/af7329930f2f1a3a84db0500b8466e2d/65338287361.pdfIn PDF document text
- https://xyoaa.org/sites/default/files/files/17519504065.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d7f6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD7F6	20296 bytes
SHA-256: `1a8795fac20c75a4cf487ec9f2c7cfca49f7899b89e9d4dbe1b49cf293a0ab2c`
`font_01_sfnt_off00010d0a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D0A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012521.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12521	10832 bytes
SHA-256: `8c7c776848ba63c91f977528d7d4cfa3237dc55ac09d9bd23eb4d7cac3dd8ee3`

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