Malicious PDF — malware analysis report

Static analysis result for SHA-256 788b7233249f4f2a…

MALICIOUS

PDF

87.0 KB Created: 2021-02-20 07:02:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b477605858740374c2de475884f6d415 SHA-1: 7ec076ddbe077e0b09ffa1ea069fc1894b71e7db SHA-256: 788b7233249f4f2a61fbda2a3c98776591765ce8196caa003d92eaffce420900
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to improve search engine rankings, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the exploitation of PDF vulnerabilities to redirect users to malicious sites.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://druttle.ru/wix?keyword=in+the+womb+national+geographic+channel+worksheet+answer+key PDF link annotation
    • https://retizobokeli.weebly.com/uploads/1/3/1/0/131070240/452328.pdfIn PDF document text
    • https://sozakipebi.weebly.com/uploads/1/3/0/8/130814717/nekizule.pdfIn PDF document text
    • https://titanukudolilip.weebly.com/uploads/1/3/6/0/136082060/5710569.pdfIn PDF document text
    • https://cdn.sqhk.co/raxasumo/ehijdXY/7784604070.pdfIn PDF document text
    • https://xelipifexejup.weebly.com/uploads/1/3/4/8/134848770/1125382.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/jeIhbhj/art_of_war_tattoo.pdfIn PDF document text
    • https://seririgikum.weebly.com/uploads/1/3/0/7/130739922/9225625.pdfIn PDF document text
    • https://cdn.sqhk.co/pidagasew/hf1hfhc/laduboj.pdfIn PDF document text
    • http://teposiliza.22web.org/copycats_media_templates.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/nowonovege/bemba_pocket_dictionary_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/bhakti_hd_photos.pdfIn PDF document text
    • http://dudulexo.epizy.com/83606733468.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/nursery_school_admission_form_format.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/crown_court_sentencing_guidelines_false_imprisonment.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/58517489756.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/81001253859.pdfIn PDF document text
    • http://vinegufoxa.rf.gd/45157999677.pdfIn PDF document text
    • https://s3.amazonaws.com/pisik/nilakisi.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/application_for_employment_form_namibia_government.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/possessive_adjectives_worksheets_for_grade_4.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_off0001096c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1096C 5468 bytes
SHA-256: 4062e7d351eba04a64604473529d33ff0a38be1f968abbdbd7b80d4e1ff93373
font_01_sfnt_off00011be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE1 10476 bytes
SHA-256: 18774de96cca45f1bec35010795434ffeddc7116c4688d1776411055b0b4a476
font_02_sfnt_off00013fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB4 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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