Malicious PDF — malware analysis report

Static analysis result for SHA-256 f999f1fa91b912ff…

MALICIOUS

PDF

70.9 KB Created: 2021-02-20 06:30:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 1c2efbf8fbe3222c0432523b84d07814 SHA-1: 343110108bed61d90b8d227ec26d8d0de4e60a1f SHA-256: f999f1fa91b912ff07dc46ac47b16a209d43696c23517215d4a95a671d38bbaa
136 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The document contains an embedded URI and a visible redirector link that points to 'https://seumenha.ru/123?utm_term=how+to+sort+data+in+pivot+table+by+month', likely intended to lead the user to a phishing website. The presence of PDF_SEO_UTM_REDIRECTOR_LINK heuristic further supports the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/123?utm_term=how+to+sort+data+in+pivot+table+by+month PDF link annotation
    • https://baxovazexozubuv.weebly.com/uploads/1/3/4/3/134318553/46fff473.pdfIn PDF document text
    • https://ketesepirexutub.weebly.com/uploads/1/3/5/3/135306065/xugemiderewaf_polopovekufojaw_wubamep_godejuduw.pdfIn PDF document text
    • https://bunepefetupudir.weebly.com/uploads/1/3/2/7/132741430/jijufilaxope.pdfIn PDF document text
    • https://cdn.sqhk.co/vabalogu/FhaJjfX/home_window_restoration_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/vixawutozama/icnhjgd/7695314106.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/giggkii/rebilupaweledew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jixabedumusuzet.rf.gd/1555123406.pdfIn PDF document text
    • http://tuwafexom.epizy.com/metformin_and_pcos.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/badri_movie_songs_kannada.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/flowers_for_algernon_reading_check_answers.pdfIn PDF document text
    • http://muvalinifotu.rf.gd/mathemagic_6_teacher_s_answer_book.pdfIn PDF document text
    • http://puligop.epizy.com/6078198468.pdfIn PDF document text
    • http://dekifovep.epizy.com/89887706945.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/mexejaxawok.pdfIn PDF document text
    • http://dudameridetira.epizy.com/denuderaxez.pdfIn PDF document text
    • http://kutepiguzusudax.epizy.com/54682747495.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/general_knowledge_test_with_answers.pdfIn PDF document text
    • http://kodadus.epizy.com/15716533632.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_off0000d81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81A 5556 bytes
SHA-256: fcfb88715f8f8618049789eda738925d8739d3e6b751352cab90b0b743816c0f
font_01_sfnt_off0000eae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE3 10468 bytes
SHA-256: a1d568525bdc3a2c3224c1a8dbe90354830a0f4a0ceeff64597035a67be844cd

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