PDF malware analysis — malicious · ef87d840e84864e0

MALICIOUS

PDF

126.1 KB Created: 2021-04-07 06:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23

MD5: 4fca033ef2cebf0e45d86edcdb9f6b30 SHA-1: 8018447fd1d76ec670306e354ebd1055cce0e5f3 SHA-256: ef87d840e84864e08a088bb8eb1e27a22b1e3199fdfef43144d53c3ea5d9627c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM' containing 30 external PDF links. One of these links, 'https://baarspo.ru/award?keyword=animals+and+their+baby+names+pdf', is directly embedded in the document body, suggesting a lure to a malicious website. ClamAV detection and ML classification further support its malicious nature, indicating it's likely a phishing or trojan distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9994

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://baarspo.ru/award?keyword=animals+and+their+baby+names+pdf PDF link annotation
- https://cdn-cms.f-static.net/uploads/4366047/normal_603a06d7d1f39.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4475872/normal_60629e6c1c27b.pdfIn PDF document text
- https://latolupolazu.weebly.com/uploads/1/3/4/0/134017494/zoxewefe.pdfIn PDF document text
- https://xurozakewera.weebly.com/uploads/1/3/1/4/131414240/mepuzitepireta-namoxajaxuboje-kupagumapijo-magotiruvugij.pdfIn PDF document text
- https://cdn.sqhk.co/tajaketo/jigdOjb/krita_brushes_for_sketching.pdfIn PDF document text
- https://pufetebad.weebly.com/uploads/1/3/4/7/134711346/988265bddb7ab9.pdfIn PDF document text
- https://cdn.sqhk.co/ranemagesoga/Nznidid/motoxiv.pdfIn PDF document text
- https://pozanabuloga.weebly.com/uploads/1/3/4/3/134366917/1f0d4.pdfIn PDF document text
- https://cdn.sqhk.co/rubutemoxe/jigjbic/kafafipufuxolopimake.pdfIn PDF document text
- https://cdn.sqhk.co/xenumobavun/eP2qgdh/gmc_sportside_bed.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/bulolimepol/bahubali_2_telugu_full_movie.pdfIn PDF document text
- https://s3.amazonaws.com/voropa/air_force_ones_white_and_black_womens.pdfIn PDF document text
- https://s3.amazonaws.com/vuxagixil/html_formatter_2_spaces.pdfIn PDF document text
- https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_89af2c7d313249c2a740b1016eb4db92.pdf?index=trueIn PDF document text
- https://5c839259-519f-4cee-a1a2-6639d654070b.filesusr.com/ugd/140efa_c3bd9109096941e9ab7b24fe6cc041ad.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/zumomasugipeno/why_did_my_steamer_stopped_working.pdfIn PDF document text
- https://s3.amazonaws.com/muvazi/basixoj.pdfIn PDF document text
- https://17673d3b-e5d0-4e0e-8211-f079fadf35f5.filesusr.com/ugd/13ae68_18e48d6de2b04602946a3117eb4d1aad.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/ragejufa/google_camera_app_for_android.pdfIn PDF document text
- https://s3.amazonaws.com/xamibebulosaxug/browser_for_android_phone_best.pdfIn PDF document text
- https://s3.amazonaws.com/muvemasoxaji/43636492600.pdfIn PDF document text
- https://efed9c07-4553-4484-a419-1b844d271aeb.filesusr.com/ugd/6f475a_19a6feb7107947b7a06fa2edac4717f2.pdf?index=trueIn PDF document text
- https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_ff9e9712482543f092a74bb71c4a6bc4.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/wofaxil/54322210002.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f524.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF524	59576 bytes
SHA-256: `d0d3af8cc79cbf8880b43c33f26125b4ebeb48163863259f316401790ca79d23`
`font_01_sfnt_off0001a6c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1A6C4	5512 bytes
SHA-256: `58b0096f2245ecae5481df63e022ff1e7012af8c10d07003dcf9243823a7befb`
`font_02_sfnt_off0001b951.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1B951	16976 bytes
SHA-256: `f3a0313de47bbfe3d9e666228278ec45fc6aff2f00633100a0dc90425a9bb88f`

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