Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbace78f37c837e…

MALICIOUS

PDF

76.6 KB Created: 2021-05-21 01:39:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 01e53eafa5c79387fad66495ba5e7c45 SHA-1: 407fe0b353b881fdb1b7192c23099a2beefdb98f SHA-256: 7dbace78f37c837e3d86bbfe012fcad924fc454a5a2d4f3cf2731e312b57e453
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The heuristic 'PDF_SEO_LINK_FARM' indicates the document contains a large number of external links, likely to host malicious content or manipulate search engine results. The embedded URLs and the document's structure suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://static.s123-cdn-static.com/uploads/4418746/normal_6000c470b4203.pdf In PDF document text
    • https://numuladak.weebly.com/uploads/1/3/4/6/134613837/jozusil-lenegetevoli-potivib-zaxozuto.pdfIn PDF document text
    • https://xesukalo.weebly.com/uploads/1/3/5/3/135311970/wosurewujeroxelefot.pdfIn PDF document text
    • https://balexasureg.weebly.com/uploads/1/3/0/8/130874281/7d54347ad58.pdfIn PDF document text
    • https://mimuromujalu.weebly.com/uploads/1/3/0/7/130739347/9cb250.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493602/normal_5fce8ede07e0f.pdfIn PDF document text
    • https://wavurujubatebar.weebly.com/uploads/1/3/2/6/132682053/7754292.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/limudanakesazixi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482618/normal_5fc6409819790.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428341/normal_603a8422c4c89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503692/normal_6018fa11cc569.pdfIn PDF document text
    • https://nibebelijatod.weebly.com/uploads/1/3/1/4/131452937/pupedij.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/bVCGPfG74RQ/wb?keyword=mixing%20and%20mastering%20services%20near%20mePDF link annotation
    • https://uploads.strikinglycdn.com/files/db74d995-40e3-44a7-9405-aeaebd393e2a/rujivajofoximasovewo.pdfIn PDF document text
    • https://s3.amazonaws.com/liguwubore/amendment_violation_matching_activity_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/35707098858.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/leggett_and_platt_adjustable_base_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/552bb58d-0277-4eee-b6a1-5e8f83d31419/what_are_the_requirements_to_avail_sss_maternity_benefits.pdfIn PDF document text
    • https://s3.amazonaws.com/tugafebip/najudufubitidozinonije.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/xefojotuxamoziwix.pdfIn PDF document text
    • https://s3.amazonaws.com/nasitevu/vlc_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/38218482384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c303c79a-77cd-48c3-ac08-77d81aeb15c9/wordpress_login_for_website.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/jail_warder_2019_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/when_did_pet_rocks_start.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_off0000eba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA7 5360 bytes
SHA-256: 190cafa79065605b0a3b1fda49e7e5c81d9e18049a898f6af890c990089096df
font_01_sfnt_off0000fde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE9 11424 bytes
SHA-256: 373b5bfdaa0f845d402c79e01a1b2ab37b7edc844a9a3ee46974c1d664e33645

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