Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b891b48f83c37c3…

MALICIOUS

PDF

89.2 KB Created: 2021-03-12 06:52:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 00b8d2a1bb63c8d3021e4f64602e7fc6 SHA-1: d81ec87adf36c99b7bda917f738331437fafc75e SHA-256: 8b891b48f83c37c31e801c7fbd2788173799c356f82fbc95770bdb7e6fd1f980
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it's a phishing lure, specifically using an SEO redirector to disguise a malicious download. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point to a common phishing tactic of offering fake downloads to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://xajibur.ru/award?keyword=oxford+picture+dictionary+pdf+drive PDF link annotation
    • http://fitokapss.xyz/mexebokur7fayz.pdfIn PDF document text
    • http://keepmaxi.space/how_to_change_legend_title_in_rqwldp.pdfIn PDF document text
    • http://tixivepemom.22web.org/bobby_mcgee_running_form.pdfIn PDF document text
    • http://redanixidofax.iblogger.org/icao_annex_14_volume_2.pdfIn PDF document text
    • http://efarbok.xyz/adidas_3mc_navy_shoes4qvkn.pdfIn PDF document text
    • https://cdn.sqhk.co/beratinuga/fhcnhcb/46167106408.pdfIn PDF document text
    • http://hesap-al-sat.com/purezufilisufelifougr41.pdfIn PDF document text
    • http://kobopez.mygamesonline.org/zusonilusojofuwojipuro.pdfIn PDF document text
    • https://cdn.sqhk.co/nojumuku/d2DH3ib/pixel_battle_royale_unblocked_weebly.pdfIn PDF document text
    • https://cdn.sqhk.co/puxezuxivas/ghhh27T/mens_card_holder_collection.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380090/normal_5ffca5650b7f0.pdfIn PDF document text
    • http://wamipivifubape.sportsontheweb.net/printer_brother_mfc-490cw_wireless.pdfIn PDF document text
    • http://natosabi.mygamesonline.org/wusobobu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486758/normal_601c6a564cc1e.pdfIn PDF document text
    • https://cdn.sqhk.co/sutazojawote/Nicjcic/48561324633.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/muxozuvalubi/fikorilijimu.pdfIn PDF document text
    • https://s3.amazonaws.com/satuja/12669388357.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/77291390159.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/languidece_que_se_significa.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/mobile_phone_covers_samsung_galaxy_s4_mini.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00012b48.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12B48 24500 bytes
SHA-256: 4d8b8ea4938ecaaa8028e5fec2c17f17c319768bd1b376aabc22c5746f0de16f
font_00_sfnt_off0000e9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C0 3296 bytes
SHA-256: 39bbde2b5107470dea6b5248cbedf679f951d82cce8149e5b90c8651441688dd
font_01_sfnt_off0000f58e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58E 5196 bytes
SHA-256: 5736b588cd695c8f27c890ca6f8422488af43bc01b15522fa609188ed3b90f6d
font_02_sfnt_off0001075c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075C 10400 bytes
SHA-256: aa2b4a39e74fc636dbe70968b33019d1b213f8a335cb4326bbb200d3b3574626

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