Malicious PDF — malware analysis report

Static analysis result for SHA-256 21309a0a91fb85cd…

MALICIOUS

PDF

76.5 KB Created: 2021-03-27 10:58:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 590dfafd42a56efd282d22c7c6906e45 SHA-1: 29717819766a486814b88be5880e1979f7187a1f SHA-256: 21309a0a91fb85cd2a08ea754380125f41c4b33103391a2eee236638f1769e49
184 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirectors and a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious redirector pattern, likely serving as a lure for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 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.
  • 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://crophysi.ru/123?utm_term=charge+off+means+your+credit+report In PDF document text
    • http://geforiro.scienceontheweb.net/modelo_de_negocio_tipo_canvas.pdfIn PDF document text
    • http://sajiwurejedetu.sportsontheweb.net/99995436195.pdfIn PDF document text
    • http://nibakelenixezas.getenjoyment.net/how_to_reset_whirlpool_duet_dryer_f01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464067/normal_60092b540c3da.pdfIn PDF document text
    • http://tesekal.mygamesonline.org/bleach_official_character_book_souls.pdfIn PDF document text
    • https://tugofemupufere.weebly.com/uploads/1/3/4/5/134584107/45124.pdfIn PDF document text
    • https://tasoxagizuj.weebly.com/uploads/1/3/4/7/134734804/afdce.pdfIn PDF document text
    • http://vizezokope.iblogger.org/6424635976.pdfIn PDF document text
    • https://vejikawotepux.weebly.com/uploads/1/3/4/8/134887167/zebeliwij_lujikipego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462986/normal_603b6895062a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376611/normal_5ff909401cb88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407069/normal_6037695268241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374013/normal_6052f8a6626b1.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/c5e64b66-fe54-49c9-98c3-8017d58e57e0/the_pact_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/movijuwanoranomifux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b131f1d-c1f9-4f32-9468-bd42dc3ef626/54709327961.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d529b59e-18c6-4e5f-bd52-2e19fbbbad88/beats_solo_3_wireless_bluetooth_headphones_-_rose_gold_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df348d6d-85e6-490e-b88f-c145bd87b872/fender_mustang_amp_gtx_100.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/ascaris_nematode.pdfIn PDF document text
    • http://girodolud.rf.gd/warhammer_undead_army_book.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/lightroom_presets_free_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/56028784607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f22d622-3de4-49a2-9c46-8ef70a4db992/48441419244.pdfIn PDF document text
    • http://xagevudogitoti.epizy.com/33222431164.pdfIn PDF document text
    • http://vapomogabu.epizy.com/robust_nonparametric_statistical_methods.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_off0000ecd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD0 5544 bytes
SHA-256: 36cf36f189abe9ae45bc09b0cb631ec128bae7779d6c035a924bf4533166d035
font_01_sfnt_off0000ff8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8D 10332 bytes
SHA-256: 133441fbd4aa507c66c0235dd73068ea8ee1ae7af12aaa8d6ceae815e342117f