Malicious PDF — malware analysis report

Static analysis result for SHA-256 18ebc64cf5be2b22…

MALICIOUS

PDF

71.4 KB Created: 2021-06-07 19:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: df8108ef0e22be49e0f3777b69c77b36 SHA-1: 124c732c04f2e7ba2f2b3fdf4cdbee1545ebb026 SHA-256: 18ebc64cf5be2b220d72ac824fe9a4ace4f0b077b2de20c36c65768f969f116e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to disposable hosting and link farms, suggesting a phishing or malware distribution campaign. The presence of external URIs and the heuristic indicating a link farm strongly suggest the document's purpose is to redirect users to malicious sites.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://oniceh.ru/pbw?utm_term=what+is+golden+ratio+in+logo+design PDF link annotation
    • https://wimugedi.weebly.com/uploads/1/3/4/7/134725841/a9bc78a05985753.pdfIn PDF document text
    • https://fumotelam.weebly.com/uploads/1/3/4/7/134734881/1434228.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4426832/normal_60b2a098b9049.pdfIn PDF document text
    • https://wabezapodila.weebly.com/uploads/1/3/1/4/131437306/wilut-luluta-tapedo-linosak.pdfIn PDF document text
    • https://xoragawamu.weebly.com/uploads/1/3/4/6/134666694/0993c284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459326/normal_6068da3b8b43b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497081/normal_5fc93dffa787d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369496/normal_5fe02b1959c57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369933/normal_5fe97f3b62e09.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gitefov.pbworks.com/w/file/fetch/144459048/cabal_warrior_guide_2019.pdfIn PDF document text
    • http://xiwitanul.pbworks.com/w/file/fetch/144442335/gonovesevapes.pdfIn PDF document text
    • http://subazim.pbworks.com/f/how_to_download_granny_2_mod_apk.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/f/6.pdfIn PDF document text
    • http://nolumemonip.pbworks.com/w/file/fetch/144563307/marixesosa.pdfIn PDF document text
    • http://sonopewobu.pbworks.com/w/file/fetch/144420675/19335751990.pdfIn PDF document text
    • http://tusawijer.pbworks.com/w/file/fetch/144464124/how_to_calibrate_relion_glucose_meter.pdfIn PDF document text
    • http://gulisapil.pbworks.com/w/file/fetch/144777888/27550492304.pdfIn PDF document text
    • http://kizisoj.pbworks.com/w/file/fetch/144516489/kosisetinosid.pdfIn PDF document text
    • http://ravaxes.pbworks.com/w/file/fetch/144793704/how_to_download_summer_time_saga_on_ios.pdfIn PDF document text
    • http://depowota.pbworks.com/w/file/fetch/144501348/jaanwar_movie_mp3_songs_free_download_320kbps.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_off0000dbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB3 5100 bytes
SHA-256: a185e66e08df059f67d58685e314632f1a0d4ebfc7bb2455f7237d4cb3196eb0
font_01_sfnt_off0000ed0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0C 10268 bytes
SHA-256: f103560f6321738a1e98f42447d95f7a6fafb8e5399f4b3797aeca84e52acb55

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