Malicious PDF — malware analysis report

Static analysis result for SHA-256 598dcb3fbbb8f919…

MALICIOUS

PDF

85.4 KB Created: 2021-03-21 10:26:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cbbeb638b5862fb723de221de89626ce SHA-1: ef8a847c664fe2cad9967827d575d610540f4849 SHA-256: 598dcb3fbbb8f919ca6d3da75dbd61b81b46357f54fca03dd486f2a14db2c5c3
156 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 and point to PDF files, suggesting a link farm or phishing attempt. One prominent URL, https://jacksth.ru/wix?keyword=pixel+gun+mod+apk+unlimited+coins+and+gems+18.0, is presented as a download for a game mod, likely a lure. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=pixel+gun+mod+apk+unlimited+coins+and+gems+18.0
    • http://kakafeg.scienceontheweb.net/monitorear_red_wifi_windows_10.pdf
    • http://navevukosuso.mypressonline.com/bemipiluzunub.pdf
    • http://kelimap.mywebcommunity.org/38198025444.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://521a9f5b-5c7e-4f25-a9e4-5446fb1b1975.filesusr.com/ugd/c1a494_c340a1ac3ed844d8be6eeb442ec22f8f.pdf?index=true
    • http://josesomesube.myartsonline.com/luwivap.pdf
    • https://uploads.strikinglycdn.com/files/9b2fabc3-4431-407f-b6d2-09431696fab4/tisopagugupebadixozulopus.pdf
    • https://s3.amazonaws.com/mulerux/sadijuvobo.pdf
    • https://4a31e3f8-49e3-4331-b1a9-c0bb7a6b9dbc.filesusr.com/ugd/599f1c_335bc624806c4e0cbc15c44c75862380.pdf?index=true
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_4295850706af4cfcad01eaa96f44d091.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4c9dab03-ff2c-4aef-84f5-10f5bf9c05ab/29305447509.pdf
    • https://uploads.strikinglycdn.com/files/b55deb49-15cb-47ff-bee0-2a0e2ffbe7b6/international_journal_of_innovative_research_in_medical_science_indexing.pdf
    • https://uploads.strikinglycdn.com/files/6790ef3e-3ba2-4b52-b744-40af1baea677/chronology_of_bible_and_world_events.pdf
    • https://uploads.strikinglycdn.com/files/806c4e63-4532-4b4d-b77a-6859f08d638f/xinoli.pdf
    • https://c02a3fa2-970f-4384-b4fa-7a60184a1b73.filesusr.com/ugd/1da3fe_c9976b512e724f158bce5a9ff517bb94.pdf?index=true
    • https://uploads.strikinglycdn.com/files/92790828-2d56-457f-82a1-ca632660f542/easy_reading_comprehension_worksheets_for_1st_grade.pdf
    • https://uploads.strikinglycdn.com/files/aecbfdbd-38eb-4215-b1ca-27988205b8b0/32239888726.pdf
    • https://4123e755-5e7e-4fb8-b167-49ba90d37259.filesusr.com/ugd/fd3290_020866757dd64fdbad68fe4d8b527690.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4d408c23-d85a-41ae-98b8-315ba7ff6714/visawipofujozuwokir.pdf
    • https://s3.amazonaws.com/tesodagiwor/website_template_for_designers.pdf
    • https://s3.amazonaws.com/jusagi/vubepuxazu.pdf
    • https://s3.amazonaws.com/wibedubosateg/jevozap.pdf
    • https://uploads.strikinglycdn.com/files/02785e12-4987-44e8-ba44-131c1cdde8ad/63685303663.pdf
    • https://s3.amazonaws.com/juvetaso/how_to_add_subtract_and_multiply_radicals.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdd9.bin
e5ff6a5eb713a715f1a1405ac1d92811a512f4ded8f5aadf9f5a93e87cae4516		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 5732 bytes
font_01_sfnt_off00011158.bin
2c242348b5c50eae572d59cf5564076ab3e690fa66a32e3c4bf82c77b19ccbee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11158 11344 bytes
font_02_sfnt_off000137d1.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x137D1 4324 bytes

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