Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d70c4aa05830c4d…

MALICIOUS

PDF

76.4 KB Created: 2021-02-18 23:10:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fdc284072b030a63f6c10aee6599b392 SHA-1: 6ed73a7a4864bc741d35b556d0ed98741e9d27a4 SHA-256: 4d70c4aa05830c4d9e560af90eb3fc083dddcd2b6225e0fbbf75005dfcc42c64
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-severity 'PDF_SEO_UTM_REDIRECTOR_LINK' rule, indicating it's designed as a phishing lure. The ML classifier and ClamAV detection further support its malicious nature. The primary IOC is the external URI used for redirection, which is likely the entry point for a phishing or malware distribution campaign.

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
  • 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.
  • 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/wix?keyword=aa+4th+step+worksheet+fears PDF link annotation
    • http://nubolutlion.xyz/vabexifoxuvifokamtuflv.pdfIn PDF document text
    • http://ita-bio.fun/gukegpyvn6.pdfIn PDF document text
    • http://blablablacar.online/197_bus_schedule_nj_transitjpvro.pdfIn PDF document text
    • http://extraterrestrials.space/does_arbys_have_chicken_salad_sandwiches2d3qj.pdfIn PDF document text
    • https://cdn.sqhk.co/matajikiwov/9haHZtZ/design_my_home_makeover_answers_level_281.pdfIn PDF document text
    • http://fezelaradelemuj.22web.org/29336900860.pdfIn PDF document text
    • http://lowuwirakob.66ghz.com/zazisumetunubipebagadoxek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370068/normal_5ffd746d7fd78.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://paruwegugu.rf.gd/36360077636.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/managing_lower_back_pain_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/73302460371.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/isbn_barcode_generator.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/29732328097.pdfIn PDF document text
    • http://wezikadedikenev.epizy.com/gestalt_principles_in_logos_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/67794522596.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/hungry_dragon_apk_mod_2019.pdfIn PDF document text
    • http://nufasezizanewi.epizy.com/tumojojadevositimivajasus.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/battle_house_full_movie.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_off0000edc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC5 5188 bytes
SHA-256: 174268d60844f2ddd9eb482219a9b98850e7313fc880f966a9fad91c5dccfd1b
font_01_sfnt_off0000ff83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF83 10796 bytes
SHA-256: 66fd676e879343ae90737891d3f6cf550e2e655487a2b7bf4a1929d52ae36871

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