PDF malware analysis — malicious · 018855a576e792c4

MALICIOUS

PDF

91.1 KB Created: 2021-03-15 17:02:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22

MD5: 418bad3fa70ac52325146577b0a10953 SHA-1: ef7ea531c6a4645342ca13e6a6e0d195d6279c36 SHA-256: 018855a576e792c4d25ae42546380a9dd0a5000124fa7ac4c32e118c3cfa00e1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links, many of which point to domains commonly used for phishing and malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan.

Machine Learning

Nyx PDF Classifier malicious score 0.9988

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://kuzutuzo.ru/strik?utm_term=ordinary+differential+equations+examples+and+solutions+pdf PDF link annotation
- https://cdn.sqhk.co/xibetevoxaj/ijgevKH/24473953113.pdfIn PDF document text
- https://cdn.sqhk.co/vavuvalegel/PibF8hi/hideo_kojima_new_silent_hill.pdfIn PDF document text
- https://cdn.sqhk.co/puvubuzu/4ziaxge/class_9_science_biology_notes_chapter_5.pdfIn PDF document text
- https://cdn.sqhk.co/rapowipijes/zHZ7hbA/34582064258.pdfIn PDF document text
- https://cdn.sqhk.co/diwamukef/r8jaI7j/nicki_minaj_saying_her_real_name.pdfIn PDF document text
- https://cdn.sqhk.co/jigekuragige/eW17Pif/gisatukavaguti.pdfIn PDF document text
- https://cdn.sqhk.co/zijatiki/0QK8Zjb/fuvixi.pdfIn PDF document text
- https://cdn.sqhk.co/masunidupag/iiIFhc2/29067281855.pdfIn PDF document text
- https://cdn.sqhk.co/jagibuvat/Fjaw8gj/underground_mma_fights_near_me.pdfIn PDF document text
- https://cdn.sqhk.co/xadeviro/g4zHeNh/cisco_rj45_to_db9_serial_console_pinout.pdfIn PDF document text
- https://cdn.sqhk.co/zopimoforaja/cnJgcIF/soposodikuzozaxitikuveke.pdfIn PDF document text
- https://cdn.sqhk.co/lekusovu/gig6qha/cinemark_movie_theater_jobs.pdfIn PDF document text
- https://cdn.sqhk.co/wixefawoz/ihiihde/singing_lessons_nyc_beginners.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/rudelazifizuvo/97677125422.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a073aac7-aa17-4853-9128-7e2666e2e223/18215617862.pdfIn PDF document text
- https://e97408dc-4b05-4e3b-9f19-f4127feb49ef.filesusr.com/ugd/a42eed_eb867cc66e6c4345876d4340eb964a42.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/ponivotigegepub/boxing_game_softonic.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a6b17dd2-9369-4c24-8b89-f8f93014dba8/como_ser_guardia_civil.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/df72966b-e274-4cee-b7a8-536d6765db99/pabuxaxekozazikokuvazi.pdfIn PDF document text
- https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_682eec35f1a94907b969b77b0389c289.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/supefujoxopubu/fitbit_charge_2_size_guide.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/3d57f4e5-f650-4d39-89d0-fa9bcd644745/christmas_carols_listen_online.pdfIn PDF document text
- https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_b07bf9575def45438938449203141700.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/zuses/50716615626.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_off00010f23.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F23	5508 bytes
SHA-256: `1e65315d39a631c8cbd55027cdfcc4caadc130f9f09e994a7008f2d5db6d7db0`
`font_01_sfnt_off000121d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x121D4	11764 bytes
SHA-256: `0ad0109249a40a93dbe630d491629df85198886b44b12d94e538c560bcb3c6e0`
`font_02_sfnt_off00014989.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14989	16092 bytes
SHA-256: `0ce4f8b47c9991bd1ed0a694d919b88134844ea7ba04d4b6a373289a8b5175c0`

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