Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee0670e31b05671…

MALICIOUS

PDF

69.2 KB Created: 2021-02-24 16:19:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 1333a09d0116bee321a597e0d4d4d525 SHA-1: b2cb7b73dd29d446a9843fb5d0670e67aa5408bf SHA-256: 9ee0670e31b05671abe03bac3e66c132e5a5cd0bd19be96fc709de843b827d13
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate attempt to direct users to numerous external sites. The presence of the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' further supports a malicious classification. The document body, though heavily obfuscated, contains references to 'Appvn latest apk 8.0.8', likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://bologen.ru/wix?keyword=appvn+latest+apk+8.0.8 PDF link annotation
    • https://vabomunebalobi.weebly.com/uploads/1/3/1/8/131856010/guxujajom_razuji_fobulosuduge_vazarusujugoja.pdfIn PDF document text
    • https://cdn.sqhk.co/vemetafije/fcihOrc/freeway_rapper_son_age.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/rxgjgei/76094876202.pdfIn PDF document text
    • https://cdn.sqhk.co/novujarogoga/1yggid8/one_deck_dungeon_pc_review.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/hfiM5gj/nitro_rc_motor_parts.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/66924318804.pdfIn PDF document text
    • https://cdn.sqhk.co/kitatoze/VQEq1je/jizobulukipige.pdfIn PDF document text
    • https://nurosizakudagag.weebly.com/uploads/1/3/4/6/134699554/baziwoxemijito.pdfIn PDF document text
    • https://xududegugi.weebly.com/uploads/1/3/1/6/131636960/d214ebd1b28.pdfIn PDF document text
    • http://wugafis.66ghz.com/brooks_brothers_red_fleece_size_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/fedelubu/gjhhJvA/45671706553.pdfIn PDF document text
    • https://lidonamu.weebly.com/uploads/1/3/4/7/134722791/tulepel-lisewufez-kefiname.pdfIn PDF document text
    • https://cdn.sqhk.co/dajebala/Zhfjcgg/nagifasi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pozidijapepore.atwebpages.com/cuantos_tipos_de_investigacion_de_mercado_existen.pdfIn PDF document text
    • http://kivajujudupogij.epizy.com/boyle_s_law_worksheet_answers_cavalcade_publishing.pdfIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/whistler_snow_report_webcam.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/germany_vs_argentina_2014_full_match.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_off0000d468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD468 5196 bytes
SHA-256: 8e4af5a478076b0a30db1af9e7c5b4eedb22194595202be10963e64d86e83579
font_01_sfnt_off0000e62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 9956 bytes
SHA-256: cf134d360491de59a59a693bf3c6995ab879d145a7664462d82fca1526bdfe36

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