Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac59a6d22d33cef…

MALICIOUS

PDF

77.5 KB Created: 2021-03-17 02:34:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ef6d31503288d107c66c8ff07389479a SHA-1: d0713d0b6735631f0761d67384573e0e6dd3886e SHA-256: 4ac59a6d22d33cef27af8533ac5421c1620997aa7cdfda4c24cd3a9e13ca15c5
164 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or trojan distribution. It contains a large number of external links, many of which are obfuscated or lead to potentially malicious content, suggesting a link farm used for SEO poisoning or to host malware. The document body, though partially corrupted, indicates a lure related to downloading a 'practical manual'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=descargar+manual+pr%25C3%25A1ctico+del+operador+de+calderas+industriales+pdf PDF link annotation
    • http://kupuzuzopojesu.22web.org/52329263242.pdfIn PDF document text
    • http://vebilodugisugod.iblogger.org/how_to_update_ti-84_plus_ce.pdfIn PDF document text
    • https://palozemoxapido.weebly.com/uploads/1/3/4/3/134366311/begolikek.pdfIn PDF document text
    • https://bevotiwi.weebly.com/uploads/1/3/1/4/131437753/bebabirema_xugerasuvi.pdfIn PDF document text
    • https://nogiwesetegi.weebly.com/uploads/1/3/1/6/131637024/nedesizadaxume.pdfIn PDF document text
    • https://viwejidem.weebly.com/uploads/1/3/1/4/131406222/tokadasilubanud.pdfIn PDF document text
    • https://pajixuga.weebly.com/uploads/1/3/2/3/132303126/9029423.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_78e9cf0e1b1442508fef16f73abd8126.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jiguwuzobozobaz/29000033152.pdfIn PDF document text
    • https://bb55feb6-a0c4-48ae-8f72-aea2c45912f8.filesusr.com/ugd/b9801a_15de1edde29048a49449bcf8c141380e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/murekedobamivukefiso.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/avast_apk_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/tudanotozalefo.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/pelevobazim.pdfIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_b76fb04be6a34ca2ba25a253036694a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faxaxos/98437261673.pdfIn PDF document text
    • https://s3.amazonaws.com/kudufigunabi/camotes_island_travel_guide.pdfIn PDF document text
    • https://1ba6f066-89d4-4445-b8a9-08a6de046ef2.filesusr.com/ugd/d40554_97d945f02c46469b967368f97b110577.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/android_auto_rotate_slow.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/2017_audi_rs7_performance_top_speed.pdfIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_2b354ffcef3d43c8ae09dd7d04ced6e2.pdf?index=trueIn PDF document text
    • http://gajovab.epizy.com/ielts_general_writing_template_task_1.pdfIn PDF document text
    • http://faxipobusevive.rf.gd/replacement_parts_for_ge_xl44_gas_range.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_off0000ec1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1A 5708 bytes
SHA-256: 8884ff3a9054f4ae5e833e7d8a957097b5ee02023dbaa92fc78a4e53d533e60e
font_01_sfnt_off0000feec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 11592 bytes
SHA-256: 186a3080719dcd1015783a8262c52f3411c554e88178cd6a0ff4091203a5e9aa

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