Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ef2b53a3332198…

MALICIOUS

PDF

81.6 KB Created: 2021-04-03 16:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a63a8823bce5bb4a10d327f847f77860 SHA-1: 82af2f89b835d32468926b48e7c13c5d401e5580 SHA-256: f0ef2b53a3332198219dc7389ced9cb7915f97c4304c98c9c6b8189b8e9af04c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent example being 'https://midufefew.ru/wix?keyword=google+docs+mean+girls', suggesting a lure to a fake Google Docs page. The document's structure and embedded links indicate it functions as a link farm designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/wix?keyword=google+docs+mean+girls PDF link annotation
    • http://wubosilafusim.iblogger.org/bedodofugu.pdfIn PDF document text
    • http://nasadaliju.22web.org/jidozuwilitomurufe.pdfIn PDF document text
    • https://sifimimufiwiz.weebly.com/uploads/1/3/4/0/134000394/1738708.pdfIn PDF document text
    • http://toxawovutax.22web.org/gabifutewutuwapigeduf.pdfIn PDF document text
    • http://xibesofene.22web.org/autobiography_of_a_mango_tree.pdfIn PDF document text
    • https://bakasilamor.weebly.com/uploads/1/3/1/4/131407315/mopitejalule.pdfIn PDF document text
    • http://nuredalad.iblogger.org/biogeography_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447437/normal_6031357121b25.pdfIn PDF document text
    • https://mesupajediruz.weebly.com/uploads/1/3/6/0/136051454/4555027.pdfIn PDF document text
    • http://kiwikinixibiko.iblogger.org/lipid_classification_structure_and_function.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492546/normal_5fe04605a0771.pdfIn PDF document text
    • http://nefuzixitelu.iblogger.org/android_studio_emulator_no_internet_access.pdfIn PDF document text
    • http://febirag.iblogger.org/82077153670.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482405/normal_6015c0054e21e.pdfIn PDF document text
    • https://biteganeger.weebly.com/uploads/1/3/4/3/134369481/419680.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sogilotewi.rf.gd/87127448891.pdfIn PDF document text
    • http://tasukifuputuf.epizy.com/piano_sheet_music_for_beginners_amazing_grace.pdfIn PDF document text
    • http://dodugan.rf.gd/bamoroleforuvivez.pdfIn PDF document text
    • http://zaxawogaxema.epizy.com/physical_science_concepts_in_action_answer_key.pdfIn PDF document text
    • http://posufimiru.rf.gd/anti_conformist_or_nonconformist.pdfIn PDF document text
    • http://lerafipisatik.rf.gd/cayetano_vs_monsod.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_off0000ec46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC46 5292 bytes
SHA-256: 7eb3c15ea0eed1f4d3b409a60ab2bda36bba9130e0bea135008d6e03d26d0ba9
font_01_sfnt_off0000fe2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2F 10612 bytes
SHA-256: dbdd189664a3344b35dbbf63b7794a162e0efc2de68cf3a6f92eb17cc3e53ac9
font_02_sfnt_off000122cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CF 16388 bytes
SHA-256: 2cadb2ae25cea88cb182acc54f62d1c218aef5f2772c4081b94d5d3cddde1204

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