Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d31bde58bd18c75…

MALICIOUS

PDF

76.0 KB Created: 2021-01-25 09:28:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 99382d45ae84dc4f8d8c29d638b52f48 SHA-1: ec2bb4baa24b1fa3c902c964af61f85b02bedf8f SHA-256: 3d31bde58bd18c75996dc06b1fe5e5e72331ecff05b748f39794c082e6d994cf
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links pointing to PDFs hosted on disposable domains, a technique often used for SEO manipulation or to distribute further malware. The presence of these link farms suggests the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://trafffe.ru/aws?utm_term=paper+chromatography+questions+and+answers+pdf PDF link annotation
    • https://barefofu.weebly.com/uploads/1/3/4/4/134492989/kogiveniw.pdfIn PDF document text
    • https://namoxatiki.weebly.com/uploads/1/3/4/4/134477177/pesexunebutave.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxokakijefe/djcicAt/rekavowewobetab.pdfIn PDF document text
    • https://waripeseditalas.weebly.com/uploads/1/3/4/0/134012866/vigujawefebijo.pdfIn PDF document text
    • http://jimubezisu.iblogger.org/kindergarten_3_d_shapes_worksheets.pdfIn PDF document text
    • http://wegijezunulej.22web.org/76501058950.pdfIn PDF document text
    • https://relulime.weebly.com/uploads/1/3/4/3/134384492/1000b1a.pdfIn PDF document text
    • https://cdn.sqhk.co/ruzudulo/1iaPMpi/limit_screen_time_apple.pdfIn PDF document text
    • https://duzobiwaroliwu.weebly.com/uploads/1/3/2/6/132696147/3136043.pdfIn PDF document text
    • https://wavoxodasamemat.weebly.com/uploads/1/3/5/3/135348105/kunumanos_pimabobobo_dajegutulapumow_pulajebu.pdfIn PDF document text
    • https://wuwotozon.weebly.com/uploads/1/3/4/3/134315251/5ce8f8.pdfIn PDF document text
    • http://mubalupuzapo.22web.org/project_report_cover_page_format.pdfIn PDF document text
    • https://zomimodobi.weebly.com/uploads/1/3/0/7/130739583/836e187fb5dcdc0.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/gigjVKg/vagidefobopotalavi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://genenapukiral.epizy.com/kifegefezuxur.pdfIn PDF document text
    • http://zilomit.epizy.com/povotopiboraw.pdfIn PDF document text
    • http://fepoxojosatomu.epizy.com/new_headway_elementary_workbook_answer_key.pdfIn PDF document text
    • http://sokevigaku.rf.gd/69502867650.pdfIn PDF document text
    • http://nodefojabotozij.rf.gd/android_adf._ly_bypass.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_off0000eb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB71 5856 bytes
SHA-256: 4aba1d22b8f60f53cb66b7fbff179c05c35468abab1099e3aa0b3ba4b8a93171
font_01_sfnt_off0000ff4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4B 10280 bytes
SHA-256: c1d17dd858cc71a7c86da7032174f81460278452862c1e77ab8577d1c9e3fc7e

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