Malicious PDF — malware analysis report

Static analysis result for SHA-256 32bf8f4c52393c16…

MALICIOUS

PDF

69.0 KB Created: 2021-05-25 11:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 02f839fe2a541326a71efe44879dbdbd SHA-1: a95c3d5b741c2da34428cc7673900185005831dd SHA-256: 32bf8f4c52393c16b2ffdb347ac376363d46b1fac2df23d8307d6c951333e095
156 Risk Score

Malware Insights

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

The PDF document contains a lure related to biology exam questions and answers, designed to trick the user into visiting a malicious URL. The PDF_SEO_LINK_FARM heuristic indicates a large number of external links, with the primary malicious URL being fokemale.ru. ClamAV also detected this as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://fokemale.ru/strik?utm_term=10+s%25C4%25B1n%25C4%25B1f+biyoloji+kal%25C4%25B1t%25C4%25B1m+yaz%25C4%25B1l%25C4%25B1+sorular%25C4%25B1+ve+cevaplar%25C4%25B1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424647/normal_6031924287cc0.pdfIn PDF document text
    • https://zuripiri.weebly.com/uploads/1/3/1/8/131856797/a7e8bd.pdfIn PDF document text
    • https://wadewasugidaf.weebly.com/uploads/1/3/0/7/130775384/semupiwevix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499673/normal_600ebc2c67ee5.pdfIn PDF document text
    • https://gaburizopa.weebly.com/uploads/1/3/1/4/131438784/wukaxunasuwuvozeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500447/normal_5fd1fd087ca56.pdfIn PDF document text
    • https://wesedujixezibo.weebly.com/uploads/1/3/1/6/131606467/ae7133b25.pdfIn PDF document text
    • https://tawedituja.weebly.com/uploads/1/3/4/8/134864040/wirevagap.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/wazotojemov/pap_smear_screening_guidelines_acog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/572f54a0-47d4-4dfc-85d4-509b410a906a/509879496.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/58145761062.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/26026687340.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/how_much_money_does_graphic_designers_make.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/you_are_the_message_roger_ailes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32d0745b-8b1e-4f4c-9626-e1538f59db46/what_are_the_4_fundamental_operations_of_mathematics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa06be87-1b3d-4ff1-961c-a8581da0ecc9/kuxugigibizogonulabegeti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19235548-3f74-4242-b2f6-a940080e4b57/modos_de_produccion_primitivo.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/bride_svg_file_free.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_off0000cb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB26 5784 bytes
SHA-256: 32cec72938c65fbfbde7b79a04ea6a8300d547be9650c6c8db6558becf5e7931
font_01_sfnt_off0000dee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE8 12008 bytes
SHA-256: fc7b244c73da6ab47890dab9fb75a075b587e0635632e2f1ecd2c395c53004b7

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