Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb29cc2328e42db…

MALICIOUS

PDF

116.8 KB Created: 2021-03-31 14:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e9b5e04002d0f3f59b59dfb7f5913524 SHA-1: a511d6cb2ca7d8ee890b94fdeab42c20055df929 SHA-256: 7cb29cc2328e42db9c69fc1bba6f2d353b3f85310870cc18396c5fcbe2062605
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains keywords related to 'Symmetry elements in crystals' and 'pdf', likely a lure to disguise the malicious intent.

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://leonvi.ru/award?keyword=symmetry+elements+in+crystals+pdf PDF link annotation
    • http://nageramuvepom.mywebcommunity.org/52122948588.pdfIn PDF document text
    • https://cdn.sqhk.co/bevurokakug/uhgWjgq/wigekefapovaxasokiditit.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/48371863893.pdfIn PDF document text
    • http://mevixonur.mywebcommunity.org/geometrical_and_optical_isomerism.pdfIn PDF document text
    • http://sefesojobibif.iblogger.org/piwutu.pdfIn PDF document text
    • http://gopusoduj.mygamesonline.org/definition_of_brand_awareness.pdfIn PDF document text
    • http://tututot.mygamesonline.org/54419151876.pdfIn PDF document text
    • https://cdn.sqhk.co/baxafapunubi/hhjh4fO/centurylink_phone_number.pdfIn PDF document text
    • https://cdn.sqhk.co/karelevo/giUpCic/crosswords_with_friends_answers_10_14_19.pdfIn PDF document text
    • http://gaxenop.medianewsonline.com/49006838461.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/gh33ihf/53527062236.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gedokimisizat.rf.gd/60002986134.pdfIn PDF document text
    • https://s3.amazonaws.com/vovopafubipu/wolf_ranges_for_sale_near_me.pdfIn PDF document text
    • http://vujiwexamofone.rf.gd/clinician_administered_ptsd_scale_for_dsm_5_caps_5_past_month.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/84823832196.pdfIn PDF document text
    • http://kepepisex.epizy.com/mathematical_biology_modeling_and_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/paxakop.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/86361148847.pdfIn PDF document text
    • http://rifimazagajide.epizy.com/is_dwg_viewer_free.pdfIn PDF document text
    • http://zumaborelap.rf.gd/xuzomuposexizanogaw.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_off000170de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170DE 5508 bytes
SHA-256: 376544e2bfd7ac98addc828140a6057c95d5445669b5e90d3e79c9ca93c79ab8
font_01_sfnt_off00018389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18389 13428 bytes
SHA-256: a14a1c0385de4110af50224b0a73efcc0c6bb1dedb09283700e2a71feb9f8d0f
font_02_sfnt_off0001b044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B044 16068 bytes
SHA-256: cf22935652bf473b7b88b7b88b8cd00700d9bd1e6d2ee22f9e6d6f4970431932

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