Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a99a0d84381374…

MALICIOUS

PDF

71.8 KB Created: 2021-02-14 14:43:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b9ab484e168fed5d4536c51cac0a9863 SHA-1: 423150b642e7259592e02c3dab00e0317d0c915e SHA-256: 83a99a0d84381374f1f2ad1db3b010dc744d471bce187ff101c724d594a01de3
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF structure itself point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=omron+hbf+514c+manual PDF link annotation
    • http://watertea.space/d_power_digivice_guidek6ebr.pdfIn PDF document text
    • http://nesobaka9.xyz/aanewale_kal_video_songz2kn7.pdfIn PDF document text
    • https://cdn.sqhk.co/nopavoboriru/xAva2ge/through_abandoned_chapter_3_secrets.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/iT7jhjf/vector_addition_and_subtraction_calculator.pdfIn PDF document text
    • https://renokogepebamon.weebly.com/uploads/1/3/2/6/132696434/velosojunetokal_jotenugax_dalisod.pdfIn PDF document text
    • http://digtalcaliper09.xyz/11885040368wjuoi.pdfIn PDF document text
    • https://sinekagu.weebly.com/uploads/1/3/4/8/134855021/luxizaga-rudiresuko-zodapisakomajel.pdfIn PDF document text
    • https://tebojejuket.weebly.com/uploads/1/3/4/7/134764489/jopinosibu-texelotej-julaw.pdfIn PDF document text
    • http://bbflowers.net/15783623805f6tvi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biwisuzasasare.rf.gd/barorreceptores_carotideos.pdfIn PDF document text
    • http://tapanowi.epizy.com/free_chess_macbook_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/yuzu_emulator_roms.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/rowuvupopigoxomiwi.pdfIn PDF document text
    • http://vizijikiwoler.rf.gd/full_form_of_adp_in_biology_term.pdfIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/81658868424.pdfIn PDF document text
    • http://fonobufusig.rf.gd/7472059527.pdfIn PDF document text
    • http://xewewiwuxadul.rf.gd/35737693423.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_off0000da44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 5372 bytes
SHA-256: 69bbde09663cec1cdd88245171fd4358607565faa3078abe036298928ad9e0f8
font_01_sfnt_off0000ec6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6E 11292 bytes
SHA-256: df4f1c8fa744a1fadc52fe7313f22d3ab4f62bb1277c0241a9625ce4e2f4f607

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