Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b9b4c7cc554a02…

MALICIOUS

PDF

66.7 KB Created: 2021-02-10 08:58:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 1e209d815716475ad67637551c82a808 SHA-1: dc5527be1b33db0cacd113a2c6a40a9a3c772bac SHA-256: 93b9b4c7cc554a024027f2ed40008d95d83e6ab03d94531585b1232534dc07f0
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://yafferge.ru/aws?utm_term=amelia+bedelia+goes+camping+worksheets In PDF document text
    • https://static.s123-cdn-static.com/uploads/4480387/normal_5ff690a6ecb8b.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/icsr78T/bike_riding_pacific_highway.pdfIn PDF document text
    • https://rawiranuxox.weebly.com/uploads/1/3/4/6/134618620/2677854.pdfIn PDF document text
    • https://xibuderopugef.weebly.com/uploads/1/3/4/0/134042602/sokegenubedo-fevipogira.pdfIn PDF document text
    • https://jiburivaduvu.weebly.com/uploads/1/3/4/4/134473865/5204602.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495536/normal_5fe562bcd065e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386613/normal_5fffc4e4c13fa.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/bipepezuwed/6256433566.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/20738716905.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/big_ideas_math_workbook_grade_8_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/korexokerajeluveded.pdfIn PDF document text
    • https://s3.amazonaws.com/remeranexe/callisto_range_guide_osrs.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/73608658214.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/7160034801.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/21814525856.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_off0000c747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC747 5772 bytes
SHA-256: be472833400c2b5aa5d821bd27c7a9dd1cdb164a6dd73e73fcabb9d08ed9ff1a
font_01_sfnt_off0000dac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 10288 bytes
SHA-256: c95787b2a16af81cfcd91ccaef5d1bdaba7c9fcf610ab8afbc40c87832cc6b0c

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