Malicious PDF — malware analysis report

Static analysis result for SHA-256 b14f6b8cddaa0de0…

MALICIOUS

PDF

66.6 KB Created: 2021-01-28 08:28:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 1342cf6522c2ea3f1df6fe580313db4e SHA-1: cddb7b73da77328c9e741daf25fcef6f1bd64dec SHA-256: b14f6b8cddaa0de0038f53d047cc74d18947e29d230f50f343df6193d9ae44f1
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/123?utm_term=introduction+to+differential+equations+boyce In PDF document text
    • https://xoregofejaba.weebly.com/uploads/1/3/4/6/134651656/0c38e7065d55.pdfIn PDF document text
    • https://polokoxukoneg.weebly.com/uploads/1/3/2/8/132816042/cc7e88a1.pdfIn PDF document text
    • http://lemopebese.66ghz.com/xerezuxolalitorasadev.pdfIn PDF document text
    • https://kumapeforurimo.weebly.com/uploads/1/3/4/6/134664671/6592986.pdfIn PDF document text
    • https://dovoviwum.weebly.com/uploads/1/3/0/7/130776035/4307438.pdfIn PDF document text
    • https://jebasiju.weebly.com/uploads/1/3/1/3/131381450/7697752.pdfIn PDF document text
    • http://guwivup.iblogger.org/biology_101_final_exam_study_guide.pdfIn PDF document text
    • https://delezebewokumod.weebly.com/uploads/1/3/0/7/130776218/5200725.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/jonora/zupamamipevakafim.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/vidya_vox_be_free_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/sodiko.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/family_tree_template_powerpoint_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/7856047618.pdfIn PDF document text
    • http://xabofaveretezu.rf.gd/tonopukamugi.pdfIn PDF document text
    • https://s3.amazonaws.com/vunizi/all_new_hollywood_movies_2018.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_off0000c9b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B9 5320 bytes
SHA-256: b47614a038a9fb1cf1029fd69e73e331e8c1acc34e5c319c472e2d7ccff516ef
font_01_sfnt_off0000dbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDB 10000 bytes
SHA-256: 43d40ce713f3fbb3babe3e47e6a1a6a36e4befaf6d4a0e3dede9fc6be8eb98a0

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