PDF malware analysis — malicious · bd46ebcdf2bc0df2

MALICIOUS

PDF

117.3 KB Created: 2021-02-15 03:37:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29

MD5: 74f2ce33c74329be4bd7e240c3c8488b SHA-1: b01e88294e5a0ec51956ea477e743f2c299e9354 SHA-256: bd46ebcdf2bc0df2d649c024bb3f4025a9e2e652962b8c5d48794efb88ad8e3d

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, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. ClamAV also detected this as Pdf.Phishing.Trojan. The embedded URLs and the overall structure suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/aws?utm_term=creative+certificate+template+psd+free PDF link annotation
- http://4escam-bot.online/toverofokevitiqdn2r.pdfIn PDF document text
- http://feldhaus-klinker-plitka.ru/8201250066061ctn.pdfIn PDF document text
- https://cdn.sqhk.co/fuzomorikat/hijp6ib/xazunidavuzenexudor.pdfIn PDF document text
- http://scrlt.xyz/extenuating_circumstances_nottingham_form85iq7.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4447663/normal_5fd67cecdedb6.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4480880/normal_6016fcffd1f4d.pdfIn PDF document text
- https://cdn.sqhk.co/lilaxikixo/dgehfie/teacher_appreciation_day_2020_october.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4379613/normal_5fdd6a46129c3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4476123/normal_60142e3cd1c9d.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4428035/normal_5fd13aa878e11.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4369189/normal_600cef3275eed.pdfIn PDF document text
- https://xisifogobodi.weebly.com/uploads/1/3/4/7/134735845/3597444.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4420760/normal_5fd79bfe6706a.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4415302/normal_5ff51ae473a64.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/vogubivajavofu/wijukezetudizekikuwebog.pdfIn PDF document text
- https://s3.amazonaws.com/pusolefosex/95885975702.pdfIn PDF document text
- https://s3.amazonaws.com/rujimidujek/84931575530.pdfIn PDF document text
- https://s3.amazonaws.com/jarawaxanivu/67718321369.pdfIn PDF document text
- https://s3.amazonaws.com/baxegezivumi/jasulupebagusaxo.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://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_off0001515d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1515D	11384 bytes
SHA-256: `359fd1ff5f22de78293d7a57b9ada3d7e5c99c83560a41faa49b4558c6ac5930`
`font_01_sfnt_off0001764e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1764E	5264 bytes
SHA-256: `4f3c57d3019025af948086a5dcd8209538810585a04ae8118f166177c4230628`
`font_02_sfnt_off00018821.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x18821	12460 bytes
SHA-256: `44c38b1f1bd1cc9f7d3a5ec9bade8e22b58f0a651d314c66289039be5a9877ce`
`font_03_sfnt_off0001b08e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1B08E	16364 bytes
SHA-256: `1c8bc4bf779fdf5fdd428ab6ddc6a1665d3fdc1c26b4364692bd94c1ed605b78`

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