Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b70a37627e8e945…

MALICIOUS

PDF

472.4 KB Created: 2021-03-21 20:53:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7c4730d5d032f70febb089d8cc37ed0f SHA-1: 0890555e0a9c7bcd94f43f45641df9e8ea9604b8 SHA-256: 4b70a37627e8e9457862337d746fdd53349f4bfc4ab07b2c5f3a36584a82d631
144 Risk Score

Malware Insights

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

The PDF contains a high-severity heuristic indicating it's a redirector link used for phishing, specifically disguised as a free download for 'Cambridge English Empower PDF'. The ML classifier also flagged it as malicious. While no scripts were extracted, the presence of a download button lure and the ClamAV detection strongly suggest a phishing campaign aimed at delivering a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7833

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/award?keyword=cambridge+english+empower+pdf+download PDF link annotation
    • https://lameperitilexi.weebly.com/uploads/1/3/1/1/131164355/b6b2f55e240.pdfIn PDF document text
    • https://xufolonul.weebly.com/uploads/1/3/2/6/132695880/5235480.pdfIn PDF document text
    • http://dressnbuy.com/dawivimeguzeop66t.pdfIn PDF document text
    • https://tajixuxax.weebly.com/uploads/1/3/4/7/134751877/zakopo.pdfIn PDF document text
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/ruxesenalajin_lusexate_luxofi_kinowe.pdfIn PDF document text
    • https://nonexivibofopuv.weebly.com/uploads/1/3/4/6/134603010/9896312.pdfIn PDF document text
    • http://vovpomnim.ru/23605044918x3xbq.pdfIn PDF document text
    • https://gezedasi.weebly.com/uploads/1/3/1/3/131378850/bavavoganuvejujo.pdfIn PDF document text
    • http://ccckkkkk.space/40225725469rcrkt.pdfIn PDF document text
    • http://fusafanomogade.iblogger.org/el_cantico_de_las_criaturas.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/9a95757a16f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cd80a66-9616-4fa7-a133-e42e67e16818/the_history_of_sexuality_volume_1_the_will_to_knowledge.pdfIn PDF document text
    • https://s3.amazonaws.com/tirimofufemukat/sheet_street_curtains_and_blinds.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72d0fe79-2065-4e42-a137-e0a54d80c0eb/zuxutabolujivexaj.pdfIn PDF document text
    • http://nodixuzotegiv.rf.gd/photoshop_design_background_images_free.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/docker_container_command_cheat_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe0c3e94-60e6-4fc0-97e0-8556ddee1c00/magnetic_ink_for_hp_officejet_4500.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/problem_escalation_matrix_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2721427-8667-43f8-ac27-51e570240c14/wall_decal_installation_instructions.pdfIn PDF document text
    • http://kisolapuri.rf.gd/gelegawuzisebow.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0006ee97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EE97 5592 bytes
SHA-256: f094357fb7a0479a81473ee79a6bc4309b8ec5348a0e27ba90eaa6cfb04c9e99
font_01_sfnt_off0007017a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7017A 16812 bytes
SHA-256: 5e114a4f7c84e7299f2da1cae6c6aa049a1d2dd6026e0fed7900e5dcfba12e31
font_02_sfnt_off0007370e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7370E 16560 bytes
SHA-256: 5731e40b87188f000a7c8c976d61d69c0678f49321296bba8a028b571786cb89