Malicious PDF — malware analysis report

Static analysis result for SHA-256 429d494aaccff58a…

MALICIOUS

PDF

71.7 KB Created: 2021-02-18 13:23:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 10172edcac3b78cb0729774f5c93f412 SHA-1: ec6779997147f2758d3b835761dc6cb2b110911c SHA-256: 429d494aaccff58af0ca1cf6d00af185afb1a62e39fa207c9b2e50d215bc5903
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external links, including one to 'maypoin.ru', suggesting a phishing or SEO spam campaign. The PDF also includes embedded links to S3 buckets, some of which are marked as benign, but the overall structure and the presence of a link farm indicate malicious intent. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

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://maypoin.ru/wix?keyword=2018+harley+fatboy+service+manual PDF link annotation
    • http://premial.su/8718698134uj8i0.pdfIn PDF document text
    • https://nasavizar.weebly.com/uploads/1/3/5/3/135322571/7889042.pdfIn PDF document text
    • https://lumixomenuvaw.weebly.com/uploads/1/3/4/7/134745504/7824739.pdfIn PDF document text
    • https://bogekivusuwi.weebly.com/uploads/1/3/4/6/134604255/vizose_vabiwomononax.pdfIn PDF document text
    • https://bezofaxifi.weebly.com/uploads/1/3/1/6/131606652/8293683.pdfIn PDF document text
    • https://rodagekutav.weebly.com/uploads/1/3/5/3/135313742/2902803.pdfIn PDF document text
    • http://wordwild-store.com/zugusalamemadinulibajavoe9eq9.pdfIn PDF document text
    • http://blu-ital.space/ball_balance_game_app_iosmm1ip.pdfIn PDF document text
    • http://kraftmann.su/732735433454i6ug.pdfIn PDF document text
    • http://linza.media/notebook_and_pencil_free_cliparti2vg1.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/zuxime/74948480856.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/english_worksheet_for_class_1_naming_words.pdfIn PDF document text
    • https://s3.amazonaws.com/goviwigax/refractive_index_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/botanewi.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/32991419809.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/zomabemodoxutikozogazulo.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/adjectives_colors_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wulotugadag/poxiwubujodetomejugalani.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/96381745234.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_off0000d1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C0 5848 bytes
SHA-256: 7a64165a3724c047bf73ba36518dc5cde4a1c7ce3ba59898b59ad8092c24d48c
font_01_sfnt_off0000e595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE595 13956 bytes
SHA-256: c078a87b2bdccaf4508b297dfc43c96b6844f142ab87db61994cf1956dc934b8

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