Malicious PDF — malware analysis report

Static analysis result for SHA-256 778707897a2d27ff…

MALICIOUS

PDF

81.6 KB Created: 2021-03-06 00:55:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c1b1a3243fb4da52f0c44320e8272efa SHA-1: 7b2b8fd66bb991fbc1cbe772fd41236fd24c3e50 SHA-256: 778707897a2d27ff2e9e3441275310babbeb8b87fa543d80391fdcf3a8d7554f
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing attempt. The document body, though heavily obfuscated, contains references to "completing the square formula with two variables" and points to external URLs, likely to redirect the user to a malicious site. The presence of embedded URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the phishing lure.

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://mezovuduw.ru/award?keyword=completing+the+square+formula+with+two+variables PDF link annotation
    • https://nodaveto.weebly.com/uploads/1/3/4/2/134266094/muloziwakivi-xotejubu-bawal-xogane.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472495/normal_5feefde36a72a.pdfIn PDF document text
    • http://momelekunizu.22web.org/fast_fibre_feeding_guidelines.pdfIn PDF document text
    • https://cdn.sqhk.co/zolulesar/bgeyXih/59054564448.pdfIn PDF document text
    • https://cdn.sqhk.co/zibomevuguli/hllVTb6/third_hand_archery_tree_stand_bow_holder.pdfIn PDF document text
    • http://pesoxigesu.iblogger.org/crucible_character_map.pdfIn PDF document text
    • http://zojidetamosab.iblogger.org/tojadexibevijazejitetot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375887/normal_5feb67a6ea149.pdfIn PDF document text
    • https://cdn.sqhk.co/fomolunuvufa/eWhvmNn/61517179662.pdfIn PDF document text
    • https://bikugepoxo.weebly.com/uploads/1/3/5/3/135351236/guguwapetikixoleg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446286/normal_603a44670bdb7.pdfIn PDF document text
    • http://dopelozaf.22web.org/always_on_display_apk_pro_cracked.pdfIn PDF document text
    • https://giduzuzetedeze.weebly.com/uploads/1/3/4/8/134853145/xevobi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_ae91bb1fff884ea0a1f1e62d880bbf7a.pdf?index=trueIn PDF document text
    • https://cfc603e6-7cd4-4c42-812b-9722deb80ae4.filesusr.com/ugd/0e9fc2_267ae31656fd4c6b8e8952c727ca712e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/84031187694.pdfIn PDF document text
    • https://s3.amazonaws.com/penale/sun_pharma_whistleblower_complaint_form.pdfIn PDF document text
    • https://s3.amazonaws.com/mefadedosuw/bitlocker_windows_7_32_bit.pdfIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_951bdfa85afa4227bb3b1717f776a1f6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/potofaw/birthday_invitation_template_free_online.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 5640 bytes
SHA-256: a12818e6cd9d9c300616149411947ba5f3adb1e4c01ac8676cf08afcb349d355
font_01_sfnt_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 15028 bytes
SHA-256: acc02014a404f374ebbf21a0e96eaae76160f55af9ec97ae2118584be5778ff6
font_02_sfnt_off00012177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12177 16096 bytes
SHA-256: 8359d1bd5fdcb7784e153890727898ae1df356a68bf28bba4321897ff39eac40

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