Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab7a8583fb3e6c1…

MALICIOUS

PDF

77.6 KB Created: 2021-03-07 17:17:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8fc2f466dce3a4d33ce51b462b1fa20c SHA-1: 7549eaff48fbde27658c435ca8b7e951aa910b9f SHA-256: cab7a8583fb3e6c1777407dbc864f30fa7ae67b749e6a0452bedf9d79cc17c30
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/wix?keyword=walgreens+wrist+blood+pressure+monitor+instruction+manual'. This URL is likely used to deliver a malicious payload or phish for credentials. The ML classifier also strongly flagged this PDF as malicious, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The presence of urgency language further supports a phishing or social engineering attack.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://yafferge.ru/wix?keyword=walgreens+wrist+blood+pressure+monitor+instruction+manual In PDF document text
    • http://muzidos.iblogger.org/siluvu.pdfIn PDF document text
    • http://organicnu.info/lindau_bodensee_tourismus_informationhq0i9.pdfIn PDF document text
    • http://springtea.space/jifitin7z66.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/hf6lDQT/nulegidifilavopip.pdfIn PDF document text
    • http://sodobinefudiguw.iblogger.org/bepavowipixerujufavefa.pdfIn PDF document text
    • http://natnat.fun/dobobi7s10y.pdfIn PDF document text
    • https://cdn.sqhk.co/xokipuxat/6eNghQm/kaputojeg.pdfIn PDF document text
    • https://cdn.sqhk.co/zomulusiku/hdYiahe/word_market_level_241.pdfIn PDF document text
    • http://mon-cmbretagne.best/didobipelezmc4.pdfIn PDF document text
    • http://teenagetutor.online/gaxeniwekotudejasokevimi8qc9g.pdfIn PDF document text
    • http://yatvoyya.fun/alcoholics_anonymous_big_book_dictionaryjyj96.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/iahgthg/caption_for_photos_with_best_friend.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/feseni/lujexewuposelo.pdfIn PDF document text
    • http://nowibitiki.epizy.com/clockwork_angel_book_order.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/78787871880.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/math_worksheets_grade_4_addition_subtraction.pdfIn PDF document text
    • https://s3.amazonaws.com/pobixedele/sokesupuxuzudetajoxugibi.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/indian_air_force_formed_in.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/insurance_business_analyst_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/make_your_own_spelling_handwriting_worksheets.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_off0000f07f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07F 5636 bytes
SHA-256: b9440a4929d9c8e0b6eba290fb27b76a3e41b85ff9e58098e827e74217000ab9
font_01_sfnt_off000103ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AC 10820 bytes
SHA-256: 1c34565872bbec00021b6af879434cc66f23b62373a4528c021e11fbc1f95cf6

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