Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f0afa811fd85779…

MALICIOUS

PDF

76.6 KB Created: 2021-03-20 10:54:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 677b25bd017faf5444f467220fa13c18 SHA-1: 616db8a94534914f1c9e428d0db7bf0d0200c471 SHA-256: 1f0afa811fd85779176545d98b5dc2dded4f8c442c6045d4f2cd448f80133913
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets, likely to trick users into clicking malicious links.

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://bologen.ru/wix?keyword=mendel+and+genetic+crosses+worksheet+answers PDF link annotation
    • http://lunagogafoxoj.sportsontheweb.net/83793648036.pdfIn PDF document text
    • http://midesamipazizuj.scienceontheweb.net/operational_amplifier_and_linear_integrated_circuits.pdfIn PDF document text
    • http://vikidavilor.22web.org/brother_in_arms_3_mod_apk_hack.pdfIn PDF document text
    • http://zaparipajomigi.scienceontheweb.net/gaggia_classic_pro_how_to_use.pdfIn PDF document text
    • http://xemepuvaxeliv.iblogger.org/combiner_plusieurs_en_1_seul.pdfIn PDF document text
    • http://larts.digital/assassins_creed_brotherhood_vaticano_district_glyph_locationy3ql4.pdfIn PDF document text
    • http://jedetifujupeg.iblogger.org/acute_coronary_syndrome_guidelines_2020.pdfIn PDF document text
    • http://futejupo.iblogger.org/basijelozodixefigej.pdfIn PDF document text
    • http://revafazamige.iblogger.org/98385681818.pdfIn PDF document text
    • http://subfamjtii.site/521448924613t7by.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gigozulugajaso.rf.gd/addition_and_subtraction_worksheets_grade_6.pdfIn PDF document text
    • http://nafakosoleg.epizy.com/8333626806.pdfIn PDF document text
    • http://pumonufagatoteb.epizy.com/38113645381.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/cuales_son_los_titulos_de_credito_derecho_mercantil.pdfIn PDF document text
    • http://bajipenu.epizy.com/books_like_cell_stephen_king_11_22_63.pdfIn PDF document text
    • http://wepinipinalojud.epizy.com/gokojewagimetab.pdfIn PDF document text
    • http://finubovuputok.epizy.com/10320782915.pdfIn PDF document text
    • http://famosug.epizy.com/98671982877.pdfIn PDF document text
    • http://rurasikawasup.epizy.com/davotaku.pdfIn PDF document text
    • http://pomigijo.rf.gd/32822450055.pdfIn PDF document text
    • http://dekifovep.epizy.com/materi_akuntansi_sebagai_sistem_informasi.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_off0000ebef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEF 5364 bytes
SHA-256: 8b7f074ebc2689aaff6391cf2468b969da9e605328ca53f302cfb9fc28943192
font_01_sfnt_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 11380 bytes
SHA-256: 021882927c6fac755d8f99a41e4671513392566a5e87b6c9cb5b242388684a7a

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