Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb89cd334c6475a0…

MALICIOUS

PDF

74.8 KB Created: 2021-02-23 19:30:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e90d965aecf36dcc6ab29bc604fc93e1 SHA-1: ed0de692f24b9987586d6b0d0742c2d8ddad9095 SHA-256: bb89cd334c6475a0fbd620c7dd05fec22082c90706cb06540a2be532bac89a5a
206 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external PDFs hosted on disposable domains, a common tactic for phishing or malware distribution. The 'Callback phishing phone lure' heuristic specifically suggests the document's content is designed to trick users into calling a fraudulent number, likely for a tech-support scam or financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • 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://jacksth.ru/strik?utm_term=best+c+programming+tutorial+in+hindi PDF link annotation
    • https://vafabifagid.weebly.com/uploads/1/3/4/5/134583570/parimeluwido.pdfIn PDF document text
    • http://love-cosmetics.shop/sunday_times_cryptic_crossword_answerstkv1h.pdfIn PDF document text
    • https://cdn.sqhk.co/xafiguzi/jb0ctsN/76920202827.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/gJHifig/swingman_baseball_logo.pdfIn PDF document text
    • http://deemonatrafik.xyz/python_data_science_tutorials_pointqdh9g.pdfIn PDF document text
    • https://cdn.sqhk.co/ragejeli/hjhhiiL/hangman_adam_page_aew_theme.pdfIn PDF document text
    • https://bibatajikoxego.weebly.com/uploads/1/3/5/3/135315017/f65c26e.pdfIn PDF document text
    • https://cdn.sqhk.co/fonixoligem/8hgifgf/how_to_hack_among_us.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/370afe6.pdfIn PDF document text
    • http://trastenmyqort.online/quantitative_aptitude_questions_for_bank_po_examgen4a.pdfIn PDF document text
    • http://cashbackk.site/accident_reports_15_freeway_todayohvtq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484358/normal_5ff78301483ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387703/normal_60272ec57dd5f.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojonujaj/bMUihha/open_houses_today_naples_fl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 5536 bytes
SHA-256: 41bca346d147d120add56c1c26e22e298390c7d6a7c2c06395c0460a3c167037
font_01_sfnt_off0000f5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BC 12040 bytes
SHA-256: ee15142d373c7520c35ce8980ad4f2c1029457e4e2f66b984dfbb1a5515890c0

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