Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0e4db747e3e08da…

MALICIOUS

PDF

76.1 KB Created: 2021-03-31 10:07:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e98fdc6df51b7643a62c4ced41122a0d SHA-1: c0372ea3576b2ebd483435c4237ef479d704d29c SHA-256: b0e4db747e3e08da5dbbea364c5ac40ffab2ea0095276dfaf32a6988685cb2a0
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/award?keyword=como+hacer+una+bibliografia+de+un+libro+pdf PDF link annotation
    • https://bewotababuruga.weebly.com/uploads/1/3/1/1/131163836/6fa53949a0.pdfIn PDF document text
    • https://gazewowotom.weebly.com/uploads/1/3/4/6/134616189/febuvuru-nivakigopowo-zesaw-midebizebig.pdfIn PDF document text
    • https://zakutawevuvukug.weebly.com/uploads/1/3/5/9/135970657/xobefikijomulofo.pdfIn PDF document text
    • https://xatuguje.weebly.com/uploads/1/3/1/8/131856293/7541431.pdfIn PDF document text
    • http://fanitukasi.22web.org/hematology_basic_principles_and_practice_7e.pdfIn PDF document text
    • https://mopopapepiror.weebly.com/uploads/1/3/2/7/132741339/974fba9d.pdfIn PDF document text
    • http://bilabugova.iblogger.org/geometria_analitica_en_ingles.pdfIn PDF document text
    • https://ligelonajoka.weebly.com/uploads/1/3/1/4/131407163/gakefizes.pdfIn PDF document text
    • https://jirorenuges.weebly.com/uploads/1/3/0/8/130874518/jefemusoletisa.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/fojaxexino/mirabolesegisosanesit.pdfIn PDF document text
    • http://wipojijize.rf.gd/nulibivaxokibesatawum.pdfIn PDF document text
    • http://wowawese.rf.gd/muwereluxegerusix.pdfIn PDF document text
    • https://s3.amazonaws.com/minabiwa/lands_end_children_s_school_uniforms.pdfIn PDF document text
    • http://gekakisowe.epizy.com/how_to_sync_summer_panorama_baby_monitor.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/wunenakejatujivan.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/systolic_hypertension_in_elderly_guidelines.pdfIn PDF document text
    • http://gewejowanasov.epizy.com/tremble_chords_d.pdfIn PDF document text
    • https://s3.amazonaws.com/nojemi/rezifinuduzigowivuf.pdfIn PDF document text
    • http://suvokejixu.epizy.com/92470558856.pdfIn PDF document text
    • http://pijebikedil.epizy.com/93361439714.pdfIn PDF document text
    • http://fuvitagenago.rf.gd/44652573273.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_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 5436 bytes
SHA-256: db91572090a225c8ceb4cc74d456931702b195778361ea71f3805178a6e999b0
font_01_sfnt_off0000fcb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB2 11724 bytes
SHA-256: af131404faa20038675095ea7559f6db47cd3ebe3f71febfb9141c9e4edd5aa1

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