Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf756a65567442b…

MALICIOUS

PDF

70.3 KB Created: 2021-02-25 00:53:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 3a44cdabaf2e2591ba715058ae87fb79 SHA-1: 9656754c1dda839ada38c7985319c931bb29565a SHA-256: adf756a65567442bdaca74eba9cb2ead203332627bde0837564ad012f9143404
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, with one prominent example being a link to a PDF hosted on s3.amazonaws.com. The presence of embedded URLs and the overall structure point towards a phishing or content-farming attack. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

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 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://seumenha.ru/strik?utm_term=wild+game+camera+walmart PDF link annotation
    • http://pepujolajerikur.66ghz.com/dmv_renewal_test_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488560/normal_6031987b27bf0.pdfIn PDF document text
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/16443269f4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471092/normal_6006e22f527be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369633/normal_60125993ea995.pdfIn PDF document text
    • http://vigorutijiwek.22web.org/how_to_pray_istikhara_for_marriage_islamqa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505358/normal_600d649abe6b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414847/normal_5fce836382aa3.pdfIn PDF document text
    • https://tafevivif.weebly.com/uploads/1/3/2/6/132682704/477d1f.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/woxorojero/visavamibikamewojimugozib.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/crm_excel_templates.pdfIn PDF document text
    • http://runopokasuvi.epizy.com/nofixapofivixujaw.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/95521055580.pdfIn PDF document text
    • http://pidezesu.rf.gd/medical_office_receptionist_resume_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pujinit/benji_the_hunted_full_movie.pdfIn PDF document text
    • http://sidepojedava.myartsonline.com/nupum.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/aieee_full_form_2018.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_off0000d574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD574 5188 bytes
SHA-256: cf5429c72fc29bc4563026773f9afd7290831525b5abe0064966a9cba44bd4ad
font_01_sfnt_off0000e718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE718 10436 bytes
SHA-256: a56cee84cdda879833bf21978c60c26f7e16cac04d1155081d38d33bf3de85cc

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