Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e4a704b281db1cd…

MALICIOUS

PDF

81.4 KB Created: 2021-04-09 18:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b8a6540b87d13f5b4f20f263c0fe10e8 SHA-1: 2304e13cced0b7885b5bfc23d0aeb090008fbd3e SHA-256: 2e4a704b281db1cdd7b0b21c91707068529899fd141c8a1b82a72d2b12af73bf
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on disposable domains or link farms, suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata related to scholarship searches, aligning with a lure to entice users to click on the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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/strik?utm_term=how+do+i+get+a+life+scholarship+in+sc PDF link annotation
    • https://nesaresivegixan.weebly.com/uploads/1/3/1/4/131453215/temokirof-bijaras-bebowifuroza.pdfIn PDF document text
    • https://kozenuxifojani.weebly.com/uploads/1/3/4/6/134665776/8620659.pdfIn PDF document text
    • http://islemleriniz.org/learn_python_app_free_downloadvn5ki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468267/normal_603690ca992c4.pdfIn PDF document text
    • https://dowisapi.weebly.com/uploads/1/3/4/2/134266119/veweb.pdfIn PDF document text
    • https://referozudu.weebly.com/uploads/1/3/0/7/130775612/7007742.pdfIn PDF document text
    • http://derobidav.iblogger.org/modal_verbs_exercises_bachillerato_with_answers.pdfIn PDF document text
    • https://dasujodiket.weebly.com/uploads/1/3/4/4/134481559/zakopuv.pdfIn PDF document text
    • http://hangzhoumetal.ru/maytag_centennial_dryer_parts_listkpzdg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365575/normal_5fdf62d4dc542.pdfIn PDF document text
    • http://bajifepeselok.sportsontheweb.net/gafekanutugesag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452863/normal_5ff121d073f40.pdfIn PDF document text
    • http://nikecortez.net/labakufogolodj1aez.pdfIn PDF document text
    • http://letxxnx.org/hoover_windtunnel_2_whole_house_belt_replacementfczji.pdfIn PDF document text
    • http://najetaxu.mygamesonline.org/lowrance_elite_5_chirp_owners_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387424/normal_60264e28cd659.pdfIn PDF document text
    • http://fastpeysistem.online/bezubaan_ishq_movie_mp4os6b1.pdfIn PDF document text
    • http://zememor.sportsontheweb.net/pesekom.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://naximeb.rf.gd/gexinorogifugopa.pdfIn PDF document text
    • http://tesoxukezeziles.epizy.com/xujapuko.pdfIn PDF document text
    • http://vurasoda.rf.gd/36165868636.pdfIn PDF document text
    • http://relivoziz.atwebpages.com/asynchronous_and_synchronous_counters.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_off0000fe50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE50 5468 bytes
SHA-256: d10b8f60b495dbba0789e2bdca6f3b7f0611d13db0eff9c8516d89117103f7e9
font_01_sfnt_off00011102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11102 11284 bytes
SHA-256: b3e560d64f838c509166bd5c870273a138ae3dcbbd9e295c8a94a27bcc389dc6

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