Malicious PDF — malware analysis report

Static analysis result for SHA-256 b017ddda2f51dae9…

MALICIOUS

PDF

78.6 KB Created: 2021-02-07 15:32:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9310ef89a920856ac1607872e9533512 SHA-1: 60c632546244d3cbac35e8cec1f596be1c2693a5 SHA-256: b017ddda2f51dae97fb6213702f87873aa294ca1c40ea3a1a08f31bb1ee255cf
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The document body, though truncated and obfuscated, contains text related to 'Pa schedule e 2018', which likely serves as a lure to direct users to the malicious URLs.

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 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://baarspo.ru/123?utm_term=pa+schedule+e+2018 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4390642/normal_6011ddcfe5973.pdfIn PDF document text
    • http://copyrightram.net/dothan_weather_report_alabamasatm6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386079/normal_5ffcd59040bb8.pdfIn PDF document text
    • http://copyright-supporthelp.com/negative_thoughts_trigger_negative_feelings_worksheet48981.pdfIn PDF document text
    • http://msertis.xyz/neoplasia_maligna_de_estomago5irtq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445333/normal_5feb1be7eac6b.pdfIn PDF document text
    • http://ebay-coupon.ru/8184144322fmnps.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385648/normal_5fded472366fd.pdfIn PDF document text
    • http://hookup153.fun/43819744296gsrjh.pdfIn PDF document text
    • http://supermagazforsale1.xyz/21067757251to1eg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455174/normal_5fce94015db41.pdfIn PDF document text
    • http://begdas.fun/11660730743pm8bq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/70997830788.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/kayle_jungle_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rizezobabub/zelda_ocarina_of_time_remake_android.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/funny_brainy_questions_with_answers.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_off0000f463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF463 5452 bytes
SHA-256: 68c22ea32d3e57c17d0e778040c9c66f5a3ded49bf51ff7275cbf0b17ee16f52
font_01_sfnt_off000106eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EB 11328 bytes
SHA-256: 56890194cb6ac7e0a1269a83460e292ef4d545aa0c9b72a39f7f625cf08af3ba

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