Malicious PDF — malware analysis report

Static analysis result for SHA-256 98af2a90ff359ee6…

MALICIOUS

PDF

94.2 KB Created: 2021-03-19 05:05:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 2c163f3c032b2e48b19eba4f9a87672a SHA-1: 9ef30357d1b5234cda42fb1a217962e17bfc3ab3 SHA-256: 98af2a90ff359ee6d0fa37111031086dd14e79dc775ef8fb8122bc26a08de2f9
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing or trojan variant. It contains numerous embedded URLs, many pointing to disposable domains, which are likely used to redirect users to malicious content or phishing sites. The document body, though heavily obfuscated, suggests a lure related to educational materials, specifically 'Class 10 science chapter 11 notes pdf', to entice users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/award?keyword=class+10+science+chapter+11+notes+pdf PDF link annotation
    • http://rezotu.xyz/mexetevucbl1f.pdfIn PDF document text
    • http://mebelrostov.ru/adventure_capitalist_support_codesl91l8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530937/normal_5fd7d2412c5f1.pdfIn PDF document text
    • http://choosemadam.site/lidamupitokeduslbfpg.pdfIn PDF document text
    • https://cdn.sqhk.co/naboxolat/guiiDal/rirurazavewirufobewe.pdfIn PDF document text
    • http://purodumezujafo.iblogger.org/kedevarev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369643/normal_602070cf00072.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/gh8hjj1/international_checkers_online.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/ahfjcux/balance_ball_chair_with_back_support.pdfIn PDF document text
    • http://distornyup.site/ragalusisuzowigatalelajaj3y26.pdfIn PDF document text
    • http://fkpravo.ru/how_do_i_change_the_channel_on_my_panasonic_cordless_phonet4agl.pdfIn PDF document text
    • http://masito.space/liruboxexe22pnn.pdfIn PDF document text
    • http://betmoy54.com/kesaze6lqpu.pdfIn PDF document text
    • http://pobasomitiji.22web.org/74424451983.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xixujoteb.epizy.com/pitasopasum.pdfIn PDF document text
    • http://lobaman.epizy.com/total_recall_2012_parents_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b3bb0a3-7766-49dc-bcca-aba949667cd8/mafagojiwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30eddf52-c591-43b5-a7e0-d11f3d6920ea/use_wired_ps3_controller_on_ps4.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_off00011b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B70 5344 bytes
SHA-256: d16a56ca44762d9375b2d4d90809c8860573b28842c6494004a3ce288328d0ab
font_01_sfnt_off00012d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D91 11788 bytes
SHA-256: 09a8616e3b68e2717e1bd0c3b2458595a4940ab763fb559296362bbb76fe4883
font_02_sfnt_off000155c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155C4 16192 bytes
SHA-256: f7c959ef3840947929b2fbf21a6f844c3d2ba9157ff04f9c13ff486e75cc34e4

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