Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bc1e1d1555e6aee…

MALICIOUS

PDF

81.0 KB Created: 2021-03-27 23:22:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 549b1a607b1e7ef42fe7fafe8e95847a SHA-1: ed2f3ec319bdbfc90522e21b2c5fdc45531015fc SHA-256: 4bc1e1d1555e6aee47c45497084b2249067c30c9ffb475af629ad4d3a18fe8c6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, indicating a link farm or distribution network. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/award?keyword=printable+calligraphy+practice+worksheets+pdf
    • https://xezamojukugenu.weebly.com/uploads/1/3/5/3/135316948/4e6912eff2534f.pdf
    • https://jomokojexenubi.weebly.com/uploads/1/3/4/8/134877089/ac7d13d6adb9a2.pdf
    • http://itwomen.space/gasedajazu68x1h.pdf
    • http://logoped-samara.ru/86325374286zwwyg.pdf
    • https://bunavomotuta.weebly.com/uploads/1/3/4/6/134606544/7938017.pdf
    • https://fujelaxu.weebly.com/uploads/1/3/4/7/134704358/jinalijodekomo.pdf
    • http://xovebud.mygamesonline.org/26363065599.pdf
    • http://itanto.space/mods_for_minecraft_ps4_freetwsrc.pdf
    • https://cdn.sqhk.co/xuruwivagezu/hahi6MG/aadhar_card_correction_form_fill_up.pdf
    • https://wofofubuw.weebly.com/uploads/1/3/2/7/132710679/8184236.pdf
    • http://lajafago.medianewsonline.com/gixew.pdf
    • http://cyberlife.store/resume_format_for_msc_biotechnology_freshersnec8v.pdf
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/moligi-dagevosu-jatoz-kosepewinuf.pdf
    • https://latavulepa.weebly.com/uploads/1/3/4/4/134461708/ripemipanada.pdf
    • https://kidamevu.weebly.com/uploads/1/3/1/4/131437276/7757930.pdf
    • https://jowidirususonin.weebly.com/uploads/1/3/0/7/130775515/fodude_gukidezomenad.pdf
    • http://shoop-ff.ru/763257833809vtpm.pdf
    • https://cdn.sqhk.co/kulamogo/gigjbjb/bismillah_khan_shehnai_free.pdf
    • https://cdn.sqhk.co/kavonalitego/hidjaq7/93553109646.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mejumobax.atwebpages.com/96755155018.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d2.bin
ba1eff6e223ec191dd9978bc63ac2308c0bb9e8acbdccfe40b3679214f4062bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D2 5816 bytes
font_01_sfnt_off0000f9a9.bin
2891518837b15abfcd42757bc4ac03932e506a2abac563b0aea216c3fd0219f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 11348 bytes
font_02_sfnt_off00012090.bin
796abb589046a6794b20638b8f3d5374798c86db7bc0cccf3f694680d91a7597		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12090 16192 bytes

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