Malicious PDF — malware analysis report

Static analysis result for SHA-256 786f4fb4eb98dd46…

MALICIOUS

PDF

69.7 KB Created: 2021-03-08 02:47:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: eb3cf3d4418dde67bd38bead79a4b995 SHA-1: 4d246e6241aa13745626d7b4a134e47e42eccb96 SHA-256: 786f4fb4eb98dd4617f81b891ebc58b7695ad01a6b4c6c2a85a19f629e30a249
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document that contains numerous embedded URLs pointing to disposable hosting domains. Heuristics indicate it functions as a link farm, likely intended to redirect users to malicious content or phishing sites. ClamAV detection and ML classification confirm its malicious nature, with the primary attack pattern involving the exploitation of user trust through a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://midufefew.ru/strik?utm_term=statistics+freedman+pisani+purves+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4482848/normal_60454ffc57ff7.pdfIn PDF document text
    • https://nuzunovi.weebly.com/uploads/1/3/5/3/135314570/kinejoxatadoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378149/normal_60455712b67d8.pdfIn PDF document text
    • http://xapizokawe.iblogger.org/manual_cetesb_de_gerenciamento_de_reas_contaminadas.pdfIn PDF document text
    • https://subolamamojoga.weebly.com/uploads/1/3/4/7/134719430/lorirutuzapodixa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487399/normal_6007bcc5ba86d.pdfIn PDF document text
    • http://tikopariwoxa.mygamesonline.org/88555329987.pdfIn PDF document text
    • https://mifurujuxix.weebly.com/uploads/1/3/3/9/133997148/5b2507b2.pdfIn PDF document text
    • http://xosubowavenu.mypressonline.com/48272009522.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446029/normal_5fde1f448eb60.pdfIn PDF document text
    • https://suwesinorilofev.weebly.com/uploads/1/3/4/0/134096988/vovagogori.pdfIn PDF document text
    • http://tadidavazutopa.sportsontheweb.net/best_homemade_diet_for_dogs_with_ibd.pdfIn PDF document text
    • http://mibemuxagegija.mywebcommunity.org/cub_cadet_ltx_1045_drive_belt_replacement.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pojozija.onlinewebshop.net/14176738828.pdfIn PDF document text
    • http://zibemusisuvimal.rf.gd/enlisted_evaluation_report_afi.pdfIn PDF document text
    • http://puteruwegadijem.epizy.com/free_editable_farewell_card_template.pdfIn PDF document text
    • https://ba85394b-11ac-4ca4-926b-74ca936c52e1.filesusr.com/ugd/5ccfc8_bd7e4ef7ccec40589becb6c61acd7ac4.pdf?index=trueIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_a88ca30bbe3041208c6e325220ef1cda.pdf?index=trueIn PDF document text
    • http://saxuvoluzoz.epizy.com/black_dog_led_zeppelin_drum_sheet_music.pdfIn PDF document text
    • http://muzoxed.rf.gd/63148275626.pdfIn PDF document text
    • http://benepuru.epizy.com/lemapedizotaleroruloja.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_off0000d34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34C 5432 bytes
SHA-256: 225a12420b331daccc249f5f236a05f7b780a55e0ccd9275c1bb68ba6f4bc4cb
font_01_sfnt_off0000e5b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B6 10752 bytes
SHA-256: 895a1da98577c401a0305ca02f0aaa1c709ae0b92bbd5d22e12dca76daf3b0ba

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