Malicious PDF — malware analysis report

Static analysis result for SHA-256 20572cb693ce81b9…

MALICIOUS

PDF

80.5 KB Created: 2021-03-05 10:43:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 3dddfe999ef8dac9df0779f29ea86e56 SHA-1: c62e585a9d61ad57a0a85f2dad6e57b8af3c9dea SHA-256: 20572cb693ce81b92bfe9e46f327d47b809874ea904fd7e2c62fe8677969fd60
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to URLs that are likely part of this lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://leonvi.ru/123?utm_term=what+is+the+romeo+and+juliet+law+in+virginia PDF link annotation
    • https://cdn.sqhk.co/mujowofapubi/jhaNicz/auto_reply_outlook_macro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392444/normal_602d1f16746d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448536/normal_6009e32479d5e.pdfIn PDF document text
    • http://velixone.66ghz.com/edexcel_a_level_maths_book_1_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460723/normal_5fe38508c326f.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/I3BRnif/pofepuvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490974/normal_603f2a57ee51b.pdfIn PDF document text
    • http://im-marceting.site/how_to_repair_analog_stick_on_ps4_controllermq3v8.pdfIn PDF document text
    • http://cupe1.ru/equivalent_fractions_worksheet_ks3_tes0vqm0.pdfIn PDF document text
    • http://tiwigibafofovit.iblogger.org/zurazaxewogijuxuzeputeru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417528/normal_5fe709baf239f.pdfIn PDF document text
    • https://cdn.sqhk.co/gutifusuf/j49hatk/71226323199.pdfIn PDF document text
    • http://neliwiveles.22web.org/xibasikevasisajoju.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/MciaidQ/download_game_guitar_band_battle_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gavuzolu.epizy.com/how_to_clean_my_dyson_v7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a13fb5b-d2ad-4499-8dea-f6d131300bc5/24880309706.pdfIn PDF document text
    • http://nolixegoxow.epizy.com/christmas_carol_dickens_italiano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d546d30c-536f-448a-94c0-2431da7067eb/bowflex_treadclimber_tc3000_exercise_machine.pdfIn PDF document text
    • http://roromopenofo.epizy.com/78599627814.pdfIn PDF document text
    • http://xuvaduw.epizy.com/email_signature_html_template_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c441e0d-c1bc-4063-9cff-0d6e306cd9db/what_does_it_mean_you_dream_about_having_a_baby_boy.pdfIn PDF document text
    • http://sonunetenigido.epizy.com/xibedonel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c03d620-02a0-4fdc-8f44-4960b22206a0/wositiluve.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A7 5364 bytes
SHA-256: 620a981054d46093c01e72302921e4fd379a056b9310270ffb77c23b0afd39e5
font_01_sfnt_off000102d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 10408 bytes
SHA-256: 5500d4734952f3ce1e1f55915312d89b7487ded6ba4b73d56dce80643f2736da
font_02_sfnt_off0001267f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267F 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333