PDF malware analysis — malicious · 6ae27b5842ba92f4

MALICIOUS

PDF

81.3 KB Created: 2021-05-23 09:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25

MD5: e23c3e5be64209aea9887be2eaba070b SHA-1: 42c18ce9719055873d75daf5cef97d83e072e717 SHA-256: 6ae27b5842ba92f445665ce617ec3b3cb042a62ad9c6188bf0acfa33bfdf4e23

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, a technique often used for SEO poisoning or to direct users to malicious sites. The heuristic 'PDF_SEO_LINK_FARM' specifically indicates a mass of external links, with one pointing to 'https://mezovuduw.ru/strik'. This suggests the document's primary purpose is to redirect users to potentially malicious content, likely for phishing or malware delivery. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 0.9990

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://mezovuduw.ru/strik?utm_term=percent+word+problems+worksheet+1 PDF link annotation
- https://xadaxiwunitari.weebly.com/uploads/1/3/0/8/130814235/8647910.pdfIn PDF document text
- https://sozakipebi.weebly.com/uploads/1/3/0/8/130814717/742bdb60.pdfIn PDF document text
- https://xoretewajojuso.weebly.com/uploads/1/3/4/4/134474148/1565405.pdfIn PDF document text
- https://tixaradizu.weebly.com/uploads/1/3/4/6/134652762/rodupelufef_vesufuzetos_gabebor.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/8f9f1ed7-f07c-4b86-a8a4-72aa80e15cb1/who_has_black_ice_r6.pdfIn PDF document text
- https://s3.amazonaws.com/fupanabivote/carrot_defense_hack_apk.pdfIn PDF document text
- https://s3.amazonaws.com/juzowilipi/what_to_do_if_my_drivers_license_expires_during_covid.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/67af0724-a921-41d9-a40c-cc1878080a54/lolafamura.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/12ce2d6b-240e-44ce-9b97-025f222c5e45/noranaxefovatobegesukol.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/fea4fa90-d402-4aa7-b5e4-d54a0a7a7c88/free_printable_animal_yoga_cards.pdfIn PDF document text
- https://s3.amazonaws.com/fosagoba/xekipel.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/9f825e96-b30b-4a06-a34b-0a810e7ac570/92421328774.pdfIn PDF document text
- https://s3.amazonaws.com/vazisi/96145768078.pdfIn PDF document text
- https://s3.amazonaws.com/jazuravazaguz/i_am_david_book_chapter_4_summary.pdfIn PDF document text
- https://s3.amazonaws.com/dotivaf/kejaboginofanefunikive.pdfIn PDF document text
- https://s3.amazonaws.com/vitelitubovuluj/gisojuzorawul.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/79d18cda-ee31-4f1c-b247-459e346fd997/jufebepufemog.pdfIn PDF document text
- https://s3.amazonaws.com/nuvukivaxiren/10_personajes_de_la_historia_de_mexico_y_que_hicieron.pdfIn PDF document text
- https://s3.amazonaws.com/wufujudisu/12728839253.pdfIn PDF document text
- https://s3.amazonaws.com/bezutu/42481619493.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/28e82016-4010-43a1-99a8-84ab14f7f01a/monenutu.pdfIn PDF document text
- https://s3.amazonaws.com/wuxupewu/16685908245.pdfIn PDF document text
- https://s3.amazonaws.com/pozokimepe/vogenivegapasobimo.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/2078ce4d-d298-410e-8f3a-b6d52fa86b66/23304349152.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_off0000e7af.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7AF	5452 bytes
SHA-256: `692e3b51b2263f7f51026793dd702b5e8689e6c5ce1e33b85717fff46d882703`
`font_01_sfnt_off0000fa22.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFA22	11284 bytes
SHA-256: `885fd628d165864ec7b2784f59173dcda10a3e886325d40b23af09793e70aead`
`font_02_sfnt_off000120df.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x120DF	16060 bytes
SHA-256: `5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330`

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