Malicious PDF — malware analysis report

Static analysis result for SHA-256 8260504197f68123…

MALICIOUS

PDF

76.3 KB Created: 2021-06-07 04:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 89a46a11d1712677c0d2a404736a289c SHA-1: 67ba83519ba9e1c39eb8c161c828146d3a14d015 SHA-256: 8260504197f68123e2b6ffbd517ecc16242b1db25f5ab5caf700db910cdaed7a
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a high-confidence heuristic firing for a redirector link that impersonates a free software download. The embedded URL points to 'smidgel.ru', which is likely a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing lure for software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://smidgel.ru/pbw?utm_term=adobe+illustrator+cs6+free+download+for+windows+8+32+bit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4477620/normal_5fee46312dd83.pdfIn PDF document text
    • https://buvawaxeve.weebly.com/uploads/1/3/0/8/130874113/punutigomito_pezinugov_suxigageradu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406191/normal_5fc90b3e904ae.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486368/normal_5fca89f667083.pdfIn PDF document text
    • https://libuxematofep.weebly.com/uploads/1/3/1/0/131070581/a8e0aff13f510.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412761/normal_603a960bc94bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409110/normal_6032275bb77b0.pdfIn PDF document text
    • https://gemebavusoduwi.weebly.com/uploads/1/3/4/7/134746442/funujitu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425910/normal_5fd09a576c9e7.pdfIn PDF document text
    • https://komidozikozapuf.weebly.com/uploads/1/3/1/4/131455883/9482997.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4459929/normal_60b795132e610.pdfIn PDF document text
    • https://zabonipe.weebly.com/uploads/1/3/4/4/134487368/5e6b3.pdfIn PDF document text
    • https://wuwawibef.weebly.com/uploads/1/3/4/6/134608234/xoguzenuwok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418399/normal_6044dbd2d617e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://noxixap.pbworks.com/f/actividades_de_lectoescritura_para_nios_de_segundo_grado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed4b43e4-00be-4860-bc25-2508b948f74f/bright_line_eating_14_day_challenge.pdfIn PDF document text
    • http://jobagej.pbworks.com/w/file/fetch/144751158/39419181433.pdfIn PDF document text
    • http://bijinim.pbworks.com/f/41309902950.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9594a44b-4bde-4b0f-870f-0aac1c3fd75a/do_peloton_shoes_run_true_to_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cd16dc2-e3da-4396-ba32-052d7ed2128e/anytone_at-5888uv_iii_tri-band.pdfIn PDF document text
    • http://wotasaful.pbworks.com/f/dragon_ball_z_tenkaichi_tag_team_para_ppsspp_descargar.pdfIn PDF document text
    • http://sepaxebi.pbworks.com/f/what_is_certificate_of_residence_malaysia.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_off0000e04b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04B 5880 bytes
SHA-256: 3d7ed7450b58c581aed6311dc9fd925a6f51b2f28dd87e546a6594b16f088514
font_01_sfnt_off0000f468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 14176 bytes
SHA-256: 6a9a613be2a9a6b8c7eb0a18eb468f355f23f1076af30903fe7b038d59616c12

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