Malicious PDF — malware analysis report

Static analysis result for SHA-256 21d73dedc6deec80…

MALICIOUS

PDF

77.4 KB Created: 2021-04-08 07:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: d9d5abc9ee1edd8075db6e730dd49a01 SHA-1: ea7c540f15d3cc4fdcbe382b11f25658d1c247f6 SHA-256: 21d73dedc6deec80276aa247acc9edfe70913fc7fd1d780e17470fdc049245b4
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a large number of external links, many of which are likely part of a link farm designed to direct users to malicious sites, such as the one found at https://nipisod.ru/wix?keyword=central+nj+craigslist+pets. The document body, though heavily obfuscated, suggests a lure related to search results or resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/wix?keyword=central+nj+craigslist+pets PDF link annotation
    • http://jemofukamuwol.22web.org/15304784809.pdfIn PDF document text
    • http://waguzeb.66ghz.com/33558466323.pdfIn PDF document text
    • https://lexijodipegi.weebly.com/uploads/1/3/4/5/134510521/melunomizofirazasit.pdfIn PDF document text
    • http://nokerigi.iblogger.org/above_the_line_urban_meyer_free.pdfIn PDF document text
    • https://wuwonemuv.weebly.com/uploads/1/3/4/5/134589345/wupifu.pdfIn PDF document text
    • http://debawipuz.iblogger.org/xifoze.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/73266f61-2c26-4a97-8546-a82e854b723f/dodenovewawetezadiwov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b7c5cc9-697d-4d58-94f1-30d9871813c4/52350888691.pdfIn PDF document text
    • https://s3.amazonaws.com/batiku/meaning_of_non_academic_performance.pdfIn PDF document text
    • http://radoletoma.epizy.com/niit_core_java_book.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/kingdom_animalia_chart.pdfIn PDF document text
    • http://sibugisijan.epizy.com/deforestation_essay_download.pdfIn PDF document text
    • http://laropijodozu.epizy.com/play_store_app_jio_store_me.pdfIn PDF document text
    • https://s3.amazonaws.com/jixeremipet/jalimalafunemapeperenonuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76e1b576-8b20-43a8-a717-5bcdb6137052/15096323122.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/aerobika_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37af0b9e-6b5b-4a58-8345-bce16b351d86/what_colors_does_red_and_purple_make.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/chaplin_movie_1992.pdfIn PDF document text
    • https://s3.amazonaws.com/dedinavesute/vekojotedaxi.pdfIn PDF document text
    • http://pudunajuge.rf.gd/nawiwanubujilemuxeketi.pdfIn PDF document text
    • http://sugebajofurite.rf.gd/goku_vs_android_18_full_fight.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_off0000ee2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 5080 bytes
SHA-256: e1b463258b2002f883e0d93e35cbdbb71aa949004ea11633a88eec6193a43566
font_01_sfnt_off0000ff85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF85 11544 bytes
SHA-256: 0db157adcf93d237cd65858846ea98678557cdcd1dba3c7d1da1d8e19875538b

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