Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed02036762ff11bf…

MALICIOUS

PDF

78.7 KB Created: 2021-03-20 10:58:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ad1e4fbef9bcd9f7288d59bed9c2e9c1 SHA-1: d723c602ed046327741fcd3a448370e5afc97b53 SHA-256: ed02036762ff11bf5df22ecb29c6a89d70166b3e8f673bd80da57d875824fa68
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple external URIs, with a primary suspicious URL being https://xezojetit.ru/award?keyword=pdf+rectangle+annotation+tool. The document body, though heavily obfuscated, suggests a lure related to PDF annotation tools, which is a common tactic for phishing or malware delivery. The presence of numerous links to disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/award?keyword=pdf+rectangle+annotation+tool PDF link annotation
    • http://fibipowokogo.sportsontheweb.net/nirexozoti.pdfIn PDF document text
    • http://gepopusoka.mypressonline.com/how_to_describe_a_tree_falling.pdfIn PDF document text
    • http://penaleduduzib.iblogger.org/career_paths_information_technology_express_publishing.pdfIn PDF document text
    • http://lujoxowuri.iblogger.org/what_are_words_that_start_with_the_letter_a.pdfIn PDF document text
    • https://julupovopanar.weebly.com/uploads/1/3/4/7/134732987/podewedibasalol_mapinafa_wavivalagov.pdfIn PDF document text
    • https://jebelobuf.weebly.com/uploads/1/3/1/4/131452997/durosedugux-dofuzowiluwopux.pdfIn PDF document text
    • https://xumebarukez.weebly.com/uploads/1/3/4/6/134687090/3112532.pdfIn PDF document text
    • http://gifudevuf.iblogger.org/czech_republic_student_visa_application_form.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://debatebarumexa.epizy.com/duwutat.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_398d9473450940d096cd3a540a5c7998.pdf?index=trueIn PDF document text
    • http://ridesetufa.rf.gd/acer_chromebook_price_in_philippines.pdfIn PDF document text
    • http://jofawapedoguw.rf.gd/drylin_linear_guide_system.pdfIn PDF document text
    • http://tugurodegid.rf.gd/did_beresheet_crash.pdfIn PDF document text
    • https://ddb1515c-011f-4d6c-9a6c-b305a2039a85.filesusr.com/ugd/477ac5_63ca81d212064387801705b0536fd1c2.pdf?index=trueIn PDF document text
    • http://zagijoriw.rf.gd/14731414233.pdfIn PDF document text
    • http://punafifa.rf.gd/hdx_7000_setup_guide.pdfIn PDF document text
    • http://nidikofuwovi.rf.gd/xubefi.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_off0000f928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF928 5012 bytes
SHA-256: a93eeeee201d1eb3b92041c7b024733803610e6de4f613dd3b7a4ac7155c7bc1
font_01_sfnt_off00010a49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A49 10480 bytes
SHA-256: 10af41d1b1a5b2423a30d7ae36cc8dbd30e61a280ad4f580aaba4b85d7d394af

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