Malicious PDF — malware analysis report

Static analysis result for SHA-256 796058d88105fc81…

MALICIOUS

PDF

63.9 KB Created: 2021-02-18 01:29:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 75c7efa440bb81ada9b97a8506b9b733 SHA-1: f665fc061762cb7fb55a8c68e1100636facc4dd9 SHA-256: 796058d88105fc813d6faed5fdee356e2723ef50a192ef426bbbb0c9764906cf
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://crophysi.ru/wix?keyword=beren+e+luthien+pdf+download PDF link annotation
    • https://cdn.sqhk.co/xoraxuvonaf/cjieh1w/4416779552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372373/normal_601054f24914c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369487/normal_600918ab6245b.pdfIn PDF document text
    • https://cdn.sqhk.co/fegadosijete/zheifhb/neogeo_battle_coliseum_pc.pdfIn PDF document text
    • http://maddot.space/banner_background_images_hd_free9708v.pdfIn PDF document text
    • http://todayshop.website/l2m_report_twitterqq162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_5fdb745e74325.pdfIn PDF document text
    • http://amorexpo.com/english_grammar_books_for_adults5rfth.pdfIn PDF document text
    • https://cdn.sqhk.co/korulifesewa/7gcDhfS/xisajafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486748/normal_601fb8bc99e0a.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/eHibgjE/8953507095.pdfIn PDF document text
    • http://5coupon.info/correct_mailing_address_format_usarcdtj.pdfIn PDF document text
    • http://thesimplycompleteseries.com/pomafeluboxofiduwojaxuratrm3x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wivukirotodit.epizy.com/can_ufc_4_be_played_on_ps5.pdfIn PDF document text
    • http://xonukekavufimil.epizy.com/m_a_communications_plan_template.pdfIn PDF document text
    • http://katevafitaga.epizy.com/89149483402.pdfIn PDF document text
    • http://bikikifuxax.epizy.com/android_games_controller_support_list.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_off0000bddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDB 5092 bytes
SHA-256: eaa93db5c1054fc23c7c896024113209cba6e9fe0e31bf8a6e1ead908b0f5317
font_01_sfnt_off0000cf3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3C 10396 bytes
SHA-256: 01583af19cf4efa20f24f4951394d625c25e213191ef90d73b1a2e06dca45823

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