Malicious PDF — malware analysis report

Static analysis result for SHA-256 591e6c1ccb62b35d…

MALICIOUS

PDF

71.3 KB Created: 2021-01-03 02:30:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: f2825b19c8c4a2df70a880b9037b4182 SHA-1: 59a3daed6efc0ccbb12741fac0d2abe8b55070f8 SHA-256: 591e6c1ccb62b35d224f7f7c8d89f959366f8107e636b5ef789308842ee2ae62
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, including a link farm, and is flagged by ClamAV as Pdf.Phishing.Trojan. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains text related to 'Newark public schools principal salary guide', suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/aws?utm_term=newark+public+schools+principal+salary+guide PDF link annotation
    • https://cdn.sqhk.co/midipumep/8gi1khh/home_design_3d_game_download_uptodown.pdfIn PDF document text
    • https://sutesesa.weebly.com/uploads/1/3/4/8/134871168/fepovimexus-rusotemub-xivipaxidinusor-dofivuborudiki.pdfIn PDF document text
    • https://sebonegipuwi.weebly.com/uploads/1/3/4/1/134108682/c7c7ef7.pdfIn PDF document text
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/jamagomare-nudurijuluwo-lawejaxer.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/8430569b-87c5-4322-b21e-5c4c9dcf2798/the_amazing_spider_man_apk_mod_unlimited_coins.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5306bd58-e8a8-4769-bb36-23ced1d2e4f0/sademotozan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c31c886-b04b-43e3-abdd-a248f6ce48c1/tugofup.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/angular_6_change_templateurl_dynamically.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/364ae389-8bcf-4f15-959f-cbd167b6f33a/usher_mp3_mix_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6e6f13-2b14-4118-9dd4-3a5fded9860c/uber_roadshow_presentation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f2af31a-b3b3-4c36-8cb5-c2ba84c88445/84299132993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d6263ad-962f-449b-aada-d54fa408edb6/23553714531.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72b19ee4-1f9e-4294-9862-a0c3771be219/snug_as_a_bug_in_a_rug_game.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD835 5700 bytes
SHA-256: d6ee3e41ea5f1f100115f5089e697e369f579f8d98df5e69deab1eeb8b5a8a6f
font_01_sfnt_off0000eba6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA6 10624 bytes
SHA-256: e798eb795e6e26ce8a5d2ebb4b0b833b3f1601a4f7e9496662ebb1bf58e5a8ec

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