PDF malware analysis — malicious · c9ca4a56d3ff5218

MALICIOUS

PDF

83.2 KB Created: 2021-03-20 01:06:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23

MD5: 6aef68248d067096155f2b053f82cadc SHA-1: cefbf0a652bc3127bea26cffb5c5ba034a9315ba SHA-256: c9ca4a56d3ff521830a0ef3ac847ed2ffca2652c67036d590e48d328b6b20553

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are SEO-optimized to appear as legitimate search results for various topics. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and the presence of a 'PDF_URI' pointing to 'kuzutuzo.ru' suggests a redirection attempt. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malicious redirection scheme.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://kuzutuzo.ru/award?keyword=cambridge+igcse+mathematics+core+and+extended+coursebook+answers+pdf PDF link annotation
- http://gitikevajup.iblogger.org/electronics_engineering_thesis.pdfIn PDF document text
- https://ferateritilew.weebly.com/uploads/1/3/4/2/134265971/9006574.pdfIn PDF document text
- https://paxexituva.weebly.com/uploads/1/3/5/3/135332474/26b00044908.pdfIn PDF document text
- https://momugidofene.weebly.com/uploads/1/3/4/2/134235368/lenobudixenabekanebo.pdfIn PDF document text
- https://zujetopefij.weebly.com/uploads/1/3/4/7/134766602/6d50f38e6b9a64.pdfIn PDF document text
- http://lujuvudav.22web.org/82215512127.pdfIn PDF document text
- https://ziresaro.weebly.com/uploads/1/3/4/5/134509830/popoviw.pdfIn PDF document text
- https://gerudupox.weebly.com/uploads/1/3/2/7/132712596/f644fd29.pdfIn PDF document text
- https://fafefojesuvun.weebly.com/uploads/1/3/4/6/134651362/poxafuk.pdfIn PDF document text
- http://xofajenakimexo.iblogger.org/iphone_watch_series_5_price_philippines.pdfIn PDF document text
- http://zoxenejuwu.iblogger.org/beginner_gym_program.pdfIn PDF document text
- https://denibemexe.weebly.com/uploads/1/3/4/5/134597338/5957717.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/nisiwanolom/arnold_ehret_diet.pdfIn PDF document text
- https://s3.amazonaws.com/kofabube/what_is_a_scanner_darkly_really_about.pdfIn PDF document text
- https://s3.amazonaws.com/wutisigila/primitive_accumulation_of_capital.pdfIn PDF document text
- http://potopaf.epizy.com/car_alternator_working_principle.pdfIn PDF document text
- http://vogusofesa.rf.gd/why_is_my_hayward_pool_heater_not_working.pdfIn PDF document text
- https://s3.amazonaws.com/sutawowirosuvuv/47331278874.pdfIn PDF document text
- https://s3.amazonaws.com/tifuwuw/best_emulator_for_android_to_play_pokemon.pdfIn PDF document text
- https://s3.amazonaws.com/napoledunadigo/happy_birthday_gif_files_free.pdfIn PDF document text
- http://fudinurozoxesa.rf.gd/73186902555.pdfIn PDF document text
- https://s3.amazonaws.com/fujadabez/formato_de_solicitud_de_noviazgo.pdfIn PDF document text
- http://sesoxevanadike.epizy.com/effective_learning_mathematics_s5a_answer.pdfIn PDF document text
- https://s3.amazonaws.com/gelawiweza/mcdonalds_app_apk.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f0a7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0A7	5804 bytes
SHA-256: `88d28a5cc850cf17f737e9a03a06c6a28195109aa413673dcf048d10431a5f63`
`font_01_sfnt_off0001044d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1044D	10632 bytes
SHA-256: `6b2d1b158efe8d25957cb82f38168d92d49e4357f84fcd8e5e998337db813b86`
`font_02_sfnt_off000128e1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128E1	16204 bytes
SHA-256: `c988415812f594187b0a0ed75dc52802e798e1695b49bd300f8412a65040a449`

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