Malicious PDF — malware analysis report

Static analysis result for SHA-256 33135d79c6f63d89…

MALICIOUS

PDF

94.3 KB Created: 2021-02-11 14:51:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 112ca730b4bdf3cc28150e5fcc997167 SHA-1: 77d93f2048782d6650dc11ba763b534f9a27f669 SHA-256: 33135d79c6f63d8903a32cbb5899bc77485fbb6466428f7fe6900016a5f85cdb
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, appears to be a lure related to 'Ap english language and composition book list'. No scripts were extracted, but the presence of external URIs and the overall detection profile strongly indicate a phishing or malware distribution attempt.

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://leonvi.ru/wix?keyword=ap+english+language+and+composition+book+list PDF link annotation
    • http://walkover.me/hp_sprocket_100_manualk8z7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381551/normal_6021d46cb32a2.pdfIn PDF document text
    • http://repair-kompov.ru/whatsapp_for_nokia_e51j8qk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470533/normal_5fcd15c80ee05.pdfIn PDF document text
    • http://allieshouseofhope.com/wilks_mathematical_statistics_1962h6f04.pdfIn PDF document text
    • http://mjawebdesign.net/35104876469z17zu.pdfIn PDF document text
    • http://55571.ru/rizobopelogemigowaoiyb.pdfIn PDF document text
    • http://bilapak.66ghz.com/free_certificate_templates_word_2016.pdfIn PDF document text
    • http://kumorepo.22web.org/iobit_driver_booster_5._5_free.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/wiwuxot/mebuvosawiselumizopuvito.pdfIn PDF document text
    • http://xasidesarilune.epizy.com/arcaea_mod_apk_1._9._1.pdfIn PDF document text
    • http://gizamir.epizy.com/rukugomura.pdfIn PDF document text
    • http://lojifasipok.rf.gd/bebuforozage.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxomigo/add_audio_to_video_software.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE7 27824 bytes
SHA-256: 0c5ecaf2204619972bdda150b128fc4357874b52b6988a2e5dd3c4a8c30e8388
font_01_sfnt_off000133f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F7 5584 bytes
SHA-256: e57399425bbb11dfabd7bbaf08d150430a2f9912dc2a48855989a7639da3b2e5
font_02_sfnt_off000146d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146D2 9960 bytes
SHA-256: fa89145fe86332c11cf03f2e5df2783cb04e8406f60952cf5eb72b6c50a9e212

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