Malicious PDF — malware analysis report

Static analysis result for SHA-256 555239c44d1da656…

MALICIOUS

PDF

77.3 KB Created: 2020-12-30 20:25:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5a4e967a4c7867fd3beaff6521a4057a SHA-1: 7d6afad026dee3a45f711130f5fd91929236316f SHA-256: 555239c44d1da6569ef9af84e15f5aa0d3b3434f36f604cfad26322c79847ccd
274 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.001 Process Injection T1204.001 Malicious Link

This PDF file contains multiple invisible and malicious redirector links, identified by the PDF_REPEATED_PAYLOAD_LINK_LURE and PDF_MALICIOUS_REDIRECTOR_LINK heuristics. These links likely lead to a phishing page, as suggested by the ML_NYX_PDF_MALICIOUS classification and ClamAV detection. The embedded text 'Check your answers at bigideasmath.com' is likely a lure to encourage interaction with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gettraff.ru/123?utm_term=check+your+answers+at+bigideasmath.com In PDF document text
    • https://vobelorigod.weebly.com/uploads/1/3/4/0/134096073/luzokolaxemuke.pdfIn PDF document text
    • https://wusaveverafojiz.weebly.com/uploads/1/3/4/3/134338410/1357497.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/3Pjbhh3/potamipuzut.pdfIn PDF document text
    • https://vifewilepame.weebly.com/uploads/1/3/4/0/134012930/kijijukomuz_zegomanefe_pegututemozolan_fitovek.pdfIn PDF document text
    • https://zorusijumabek.weebly.com/uploads/1/3/4/8/134851431/dokoko.pdfIn PDF document text
    • https://cdn.sqhk.co/febutatesu/dDheVij/radio_en_vivo_mexico_noticias.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/setigafat/android_bottom_sheet_fragment_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/servidor_webdav_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gitipelut/ngrx_tutorial_angular_6.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/wuzitawedigoxuxufuwogadow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a161921-52dc-4778-9e9c-dbd4dbb91534/xipelobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1969684e-9ca1-412b-bc30-3848b3d3816d/13585019627.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/minuet_in_g_beethoven_sheet_music.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_off0000d790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD790 5656 bytes
SHA-256: c2c83fd74164d037255c327efc327b74daa4124080434005bacf7680c0d85531
font_01_sfnt_off0000eac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC1 11888 bytes
SHA-256: e55ed35b4c9166498ba9e4362952530018225901a29e3ab18e2d44acc262d66b
font_02_sfnt_off000112ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112AB 16148 bytes
SHA-256: 43dd7310e986e37c0562d6efd2a67b6291a0d41fa892ecd43b306c3e7231f7b7

Open this report in the interactive analyzer, or submit your own file for analysis.