Malicious PDF — malware analysis report

Static analysis result for SHA-256 e625b51d4007be1c…

MALICIOUS

PDF

73.1 KB Created: 2021-04-01 19:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1c339a5a23a83aea70a5c3582ffcf91f SHA-1: c53174caf8ad52dcbc1c7ac8251f5a123e3ae8a7 SHA-256: e625b51d4007be1c6ef67e349e17f3ec42ec574b394cbd009604832dfa0d20a4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to reference educational admission forms, a common lure for phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/123?utm_term=amity+university+ranchi+admission+form PDF link annotation
    • http://organize.shop/wogoztxiit.pdfIn PDF document text
    • https://samitezoderedo.weebly.com/uploads/1/3/4/4/134488512/8267261.pdfIn PDF document text
    • http://tedurelaseji.mygamesonline.org/42346270655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393644/normal_6055a2d96e6d3.pdfIn PDF document text
    • https://felaxifuf.weebly.com/uploads/1/3/5/3/135320117/feridu_zamijapuvoxupol_tagaz_vadedo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385412/normal_6058f3d81de9e.pdfIn PDF document text
    • http://wofonefa.iblogger.org/how_to_show_layers_in_sketchup_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zubejavaxuvu/hf3uopX/ruririzujasijimu.pdfIn PDF document text
    • http://submonster.xyz/best_english_grammar_book_free_download7oebv.pdfIn PDF document text
    • http://tazikuruwuwozu.22web.org/lijesobifekulenonazawasu.pdfIn PDF document text
    • https://nojijakifon.weebly.com/uploads/1/3/4/0/134012839/vuguwutazuxunagakatu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402032/normal_5fea149182510.pdfIn PDF document text
    • https://cdn.sqhk.co/jabupexipa/hhoggLP/8242800544.pdfIn PDF document text
    • https://kobexozabegubom.weebly.com/uploads/1/3/3/9/133999893/6dd32fdd4.pdfIn PDF document text
    • https://cdn.sqhk.co/dusaradezat/Yunjjwv/legend_of_zelda_sword_in_stone.pdfIn PDF document text
    • http://table-wait.com/notability_bullet_journal_template6197d.pdfIn PDF document text
    • https://funesovikigaje.weebly.com/uploads/1/3/0/7/130740183/nurowexitepipog.pdfIn PDF document text
    • http://bitiwiz.medianewsonline.com/94589479533.pdfIn PDF document text
    • https://cdn.sqhk.co/nufesewepi/ehcheqm/wutedudafusipopezejapegu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488580/normal_6008cf81ba706.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367632/normal_604045f5da004.pdfIn PDF document text
    • http://tevaruv.sportsontheweb.net/advanced_trauma_life_support_10th_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/AGyjbJ6/84310032270.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000de46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE46 5380 bytes
SHA-256: db691140106780fd67768f4fe16532ec4424d67ad0fe343abe20b9e7423a5ce8
font_01_sfnt_off0000f073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF073 10788 bytes
SHA-256: 7c53d32fb94981d53b64a8ad129b1ccac94bb4d185aa01b34c95d894a9126401

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