Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb90bc0876477859…

MALICIOUS

PDF

78.1 KB Created: 2021-03-28 06:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: be7d3f06b319f7b9835e7f013c92250a SHA-1: aacbf65aa0c4f8201b271a889f26b0a6de17910b SHA-256: cb90bc0876477859814cc68f1e54f09c7c6cd4029698e8385cb2ed2b138070da
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious sites, potentially for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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
  • 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.
  • 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://jumiwimov.ru/award?keyword=l+appareil+respiratoire+anatomie+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375093/normal_602ad1ae35efd.pdfIn PDF document text
    • http://student-yurist.ru/motorola_sbg6580_setup_bridge_mode2laeq.pdfIn PDF document text
    • https://dudafizegananif.weebly.com/uploads/1/3/4/8/134864336/pikajotojuju.pdfIn PDF document text
    • http://tifusavegapawuf.mygamesonline.org/jenepomox.pdfIn PDF document text
    • https://cdn.sqhk.co/puwipaneke/pichdw9/diversify_away_synonym.pdfIn PDF document text
    • http://vnds-super.space/a_christmas_carol_bbc_one_2019_castixu64.pdfIn PDF document text
    • http://tedurelaseji.mygamesonline.org/gesavowu.pdfIn PDF document text
    • https://xugubevowasisof.weebly.com/uploads/1/3/4/8/134885616/c026ea1ea94a.pdfIn PDF document text
    • https://cdn.sqhk.co/rapawaferew/jgFjicT/3732032539.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421461/normal_60549003ae5d7.pdfIn PDF document text
    • https://dakemowizip.weebly.com/uploads/1/3/4/4/134485630/felanuxefi-pozilukex-sasadajowerozid-wasad.pdfIn PDF document text
    • https://wemogutidagumov.weebly.com/uploads/1/3/4/6/134669151/1719517.pdfIn PDF document text
    • https://cdn.sqhk.co/sifilefu/iageQNJ/big_button_cordless_phone_for_elderly.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492294/normal_6007e78f98806.pdfIn PDF document text
    • https://cdn.sqhk.co/riwaxagi/chgigqL/carnival_cruise_lines_reopen.pdfIn PDF document text
    • http://ru-payment.casa/pearl_of_great_price_biblep29yc.pdfIn PDF document text
    • https://cdn.sqhk.co/joribuluf/2ieibjc/car_scanner_elm_obd2_app_ios.pdfIn PDF document text
    • http://desokore.medianewsonline.com/96286756425.pdfIn PDF document text
    • http://lnstagramoriginal.com/basel_stadtplanjudej.pdfIn PDF document text
    • https://cdn.sqhk.co/lisupixiwe/ckSiagc/bass_pro_shops_boats_nitro.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/dcjjggX/diamond_archery_bow_case.pdfIn PDF document text
    • http://tiktokhd.design/pegafesv00ng.pdfIn PDF document text
    • https://cdn.sqhk.co/mevexobuzur/gephiqN/bovada._lv_customer_service_phone.pdfIn PDF document text
    • https://kenomipijisax.weebly.com/uploads/1/3/3/9/133986884/jorisugix.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409840/normal_5fe30c387ccd4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nakarajibap.myartsonline.com/junepimugatujipafa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 5128 bytes
SHA-256: dd4078dc724d722173db36f39be067b720e90cbf24bf58b35d8ae1f251e83915
font_01_sfnt_off000102f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F5 12608 bytes
SHA-256: 561447336d4a1fadd777213cb3148465411f3d41e98f51af4310855e304d4cc2