Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb828228f373b702…

MALICIOUS

PDF

82.7 KB Created: 2021-03-26 09:30:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 49fc816b9d9e8fa9f58fceb7edbaf0ec SHA-1: 511c3654f5e796aabd5f90ba859d68bdb92d78f8 SHA-256: cb828228f373b702ad23e923e0996d5b578f546bb1de6118cafa2fa655e85983
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified as a phishing/malware lure by ClamAV and ML classifiers. The document body, though heavily obfuscated, suggests a theme of 'time and work formulas' to entice users. The presence of multiple external URLs, some with unknown reputations, further supports a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xajibur.ru/award?keyword=time+and+work+all+formula+pdf PDF link annotation
    • http://memowelubi.mygamesonline.org/82381414903.pdfIn PDF document text
    • http://trendmobile.ru/616788678259pk9s.pdfIn PDF document text
    • http://winclean-shop.space/2158823820333mrs.pdfIn PDF document text
    • http://50offstore.pro/momelorokehdmfu.pdfIn PDF document text
    • http://tesugujinarijag.mywebcommunity.org/sezuwitoti.pdfIn PDF document text
    • http://delinapod.mypressonline.com/xerox_wc_7845_specs.pdfIn PDF document text
    • http://vetovikaxu.mypressonline.com/nalulakikiduwiz.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/b0f2ec71-65f0-4dfa-8fde-48abee161ab9/venta_airwasher_cleaner_8.5_oz_clear.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/interpretation_of_data_research_report.pdfIn PDF document text
    • http://lejiletuvasipib.onlinewebshop.net/batoxuziwo.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/telephone_billing_system_project_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d98586e1-63d3-4e88-9990-a707c1413221/motejupot.pdfIn PDF document text
    • http://terojujulemon.rf.gd/jepep.pdfIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_276846f75d6e4d979870669c71544d75.pdf?index=trueIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_dc806ef515a6402a8eb117da63e3a8cc.pdf?index=trueIn PDF document text
    • http://zotuxegusam.epizy.com/15046268031.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_off0001045b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1045B 5112 bytes
SHA-256: 7e666d99ebab8321c5220d3dbb21a804297222962fd1e6e94c9f992b8d509758
font_01_sfnt_off000115c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115C2 11888 bytes
SHA-256: 795826dd5a4d9df3f00e6e51f2eaf0f68e58e52e369afa49f48c3d194912c287

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