Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ec44f3bf63d8cb…

MALICIOUS

PDF

78.8 KB Created: 2021-02-21 08:52:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1e4f1c5fbb08bc12a059cba80400ba83 SHA-1: e0dfbba64055904c7208bfde102ad75c398082d9 SHA-256: b0ec44f3bf63d8cb7f462b31ac93280866130eb35bbc12b1dd9ec908d12291b7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on 'jottigo.ru', suggesting a phishing or scam attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, further supporting malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature of the file.

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://jottigo.ru/123?utm_term=the+whipping+boy+novel+study PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4483082/normal_60245acb5caf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_600f93fd4e8e0.pdfIn PDF document text
    • http://kozizukexepuf.22web.org/60061298275.pdfIn PDF document text
    • https://cdn.sqhk.co/xazewizol/lFifidb/friends_tv_show_hd_wallpapers_1080p.pdfIn PDF document text
    • https://cdn.sqhk.co/sunomedude/ijj7hf1/evowars._io_hack_online.pdfIn PDF document text
    • https://cdn.sqhk.co/bowevuva/DOPhdij/97265480689.pdfIn PDF document text
    • https://cdn.sqhk.co/lilanoto/eibrhdA/buxakizuzelatuwevo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471946/normal_60016a0422ba2.pdfIn PDF document text
    • https://cdn.sqhk.co/gejixoneku/hhfiaxn/86029314867.pdfIn PDF document text
    • https://cdn.sqhk.co/zipirevofu/dMhc6nF/forest_hd_wallpaper_for_android_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/kujotukil/rhhIHgg/parkour_rush_pvp_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/fekawifen/hhdN2KC/11092752320.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/gf1Ogjz/879047490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462974/normal_60230420da61b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gamutikaguz.rf.gd/55473632987.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/angle_of_repose_experiment.pdfIn PDF document text
    • http://rukotig.rf.gd/lutenabefiwomizudeko.pdfIn PDF document text
    • http://miloxirabufa.epizy.com/best_hd_movies_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/37850449988.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_off0000f61b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61B 5260 bytes
SHA-256: cab79588586098d8f7a2db74224739f9499075ad4e9391f2b6d6054f0ca581b1
font_01_sfnt_off0001081a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081A 11044 bytes
SHA-256: 3f4154e1ff00eae360b7a20bf0893f9b74b1d0172e0b57c05b454a82297cad8f

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