Malicious PDF — malware analysis report

Static analysis result for SHA-256 273afd760c53efe0…

MALICIOUS

PDF

74.3 KB Created: 2021-03-12 13:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0ea2b5c19ba020e081b70cb39a99d5f0 SHA-1: e77842138c0db20a005af637ea3f13edb156dd1d SHA-256: 273afd760c53efe0c3fe5e3650922cb6a8b5042b628e93f93f5b25ba4e0ead98
136 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. The PDF contains an embedded URI and an SEO redirector link pointing to 'https://gimoguvi.ru/123?utm_term=fundamentals+of+business+process+outsourcing+102+pdf', which is likely part of a phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick the user into downloading further malicious content, aligning with spearphishing tactics.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://gimoguvi.ru/123?utm_term=fundamentals+of+business+process+outsourcing+102+pdf PDF link annotation
    • http://copyrighthelpptteam.com/49788321230sp82q.pdfIn PDF document text
    • http://istlan.space/discovering_the_lifespan_2nd_editionivmi8.pdfIn PDF document text
    • http://msertis.xyz/turn_on_wifi_dell5jg83.pdfIn PDF document text
    • http://fitusaj.22web.org/28283944768.pdfIn PDF document text
    • http://mamajan.space/dnd_5e_carry_weight_calculator3lfzk.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/john_bollinger_on_bollinger_bands.pdfIn PDF document text
    • http://lotto-investclub.com/wakanawidafolim8o5ol.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/jepinebawo/61186313418.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/mail_format_for_meeting_appointment.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/94170312888.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/gwent_tlg_meta_report.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/fugijimepiwowopanotu.pdfIn PDF document text
    • http://fegatiteberev.epizy.com/cavendish_close_infant_school_ofsted_report.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/bharaate_songs_w.pdfIn PDF document text
    • http://todidetiped.onlinewebshop.net/mumeboxusufejedativurogez.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/ramemupa.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/16_personalities_test_review.pdfIn PDF document text
    • http://navebulaj.epizy.com/7167146048.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/wuxer.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_off0000e41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41F 5896 bytes
SHA-256: 8ff66acb3658c8b632c5b0fab45b972e035598071e818c12a57c6569ec1fb0b2
font_01_sfnt_off0000f81d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81D 10428 bytes
SHA-256: cfaaa133b8bf166768d8368100e9621479ebc3d4d2f6fa0679475b10d7be6afb

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