Malicious PDF — malware analysis report

Static analysis result for SHA-256 64330def2d305033…

MALICIOUS

PDF

73.8 KB Created: 2021-02-27 03:31:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: fe135699b23050c571d6e5f115b012e7 SHA-1: d5d9653b45a446e7dc016942832f475103387f0f SHA-256: 64330def2d3050333152abf8e8afcc13227da085422c2c24d7399aa5147049ee
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/wix?keyword=review+solving+quadratics+worksheet+answer+key PDF link annotation
    • http://zikewexer.scienceontheweb.net/broad_opening_statement_examples.pdfIn PDF document text
    • http://kefets.xyz/adnan_syed_stephanie_mcpherson_redditt1hzd.pdfIn PDF document text
    • http://talemine.getenjoyment.net/vipalutolikirun.pdfIn PDF document text
    • https://xevowuzari.weebly.com/uploads/1/3/1/4/131437308/2639875.pdfIn PDF document text
    • https://woxoxuwavi.weebly.com/uploads/1/3/4/6/134689382/8d367b5d.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/vmLiajh/global_citizenship_speech_topics.pdfIn PDF document text
    • https://nezivubu.weebly.com/uploads/1/3/1/3/131384481/04f941609.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/xaguzimilamopavumiz.pdfIn PDF document text
    • https://jagevugabawe.weebly.com/uploads/1/3/4/6/134631244/4976060.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/jgjdjcV/67198206502.pdfIn PDF document text
    • http://atomyimperial.ru/diablo_3_barbarian_gems_guidew6d46.pdfIn PDF document text
    • http://fakixigulidol.mywebcommunity.org/what_your_fifth_grader_needs_to_know.pdfIn PDF document text
    • http://medicalpracticementor.com/limulazironugiwixul3frrl.pdfIn PDF document text
    • http://insurancecarusa.com/morulo9csuy.pdfIn PDF document text
    • https://cdn.sqhk.co/febapaji/gip1Eja/50684584596.pdfIn PDF document text
    • https://cdn.sqhk.co/jigixomavola/jcxFibz/74885511891.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/jfigWFn/11635635988.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/fractions_worksheets_grade_8.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/libiwuxofuvozuf.pdfIn PDF document text
    • https://s3.amazonaws.com/tenunud/bypass_app_for_pubg_uc_hack.pdfIn PDF document text
    • https://s3.amazonaws.com/meludav/fofanenedamakanipesirelo.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_off0000e221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE221 5652 bytes
SHA-256: 4d3b5e6c99f6bb89a2da6f736f4e74c5c4a98a317151da7ee36e79190f752ee3
font_01_sfnt_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 10828 bytes
SHA-256: b4d8850cb1680e236db51bdc25d377b8dbf642c92b6b47e6312352e6e3dd33c8

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