Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ac4be992e56067…

MALICIOUS

PDF

98.8 KB Created: 2021-03-14 01:36:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5666ea1e19c9292feba351aa89f4ac9c SHA-1: beef3d1bd54f8e6ad1fa50c1a42ab4454fc0d003 SHA-256: 37ac4be992e56067dab6b19a3b061ea6a72aacce862c66086477dc24e827b599
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1566.002 Spearphishing Link T1059.007 JavaScript

This PDF document exhibits strong indicators of a credential phishing attack, specifically impersonating Citibank. The presence of external URIs and a high ML classifier score, combined with heuristics flagging it as a brand-impersonation credential phishing lure and a callback phishing lure, strongly suggests its malicious intent. The document likely directs users to a malicious site to harvest credentials, as indicated by the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Brand-impersonation credential phishing lure critical SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: action link to abused redirector https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/443049.pdf.
  • 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://vilenefex.ru/award?keyword=singapore+payroll+process+pdf PDF link annotation
    • https://mefixakiderix.weebly.com/uploads/1/3/4/3/134319494/443049.pdfIn PDF document text
    • http://lizuzezusad.medianewsonline.com/spoken_english_guru_book_download.pdfIn PDF document text
    • http://juzonot.22web.org/11435570986.pdfIn PDF document text
    • http://rijewomel.scienceontheweb.net/adonis_golden_ratio_training_program.pdfIn PDF document text
    • https://cdn.sqhk.co/denidugabuni/thigdib/book_maker_android_app.pdfIn PDF document text
    • https://cdn.sqhk.co/genonitag/Fxc6chi/6357365307.pdfIn PDF document text
    • https://wejitikokajed.weebly.com/uploads/1/3/4/6/134655746/lifomodu_zufosununofe.pdfIn PDF document text
    • https://vujewixijul.weebly.com/uploads/1/3/1/4/131437312/7e409ea.pdfIn PDF document text
    • https://mumoporexebaxuz.weebly.com/uploads/1/3/4/3/134339912/d3731d9c1294d5.pdfIn PDF document text
    • https://cdn.sqhk.co/mezugifosa/ijhjjbb/93840082550.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ded59089-0fe7-4b03-99d8-846cc2ef4944/david_rockefeller_memoirs_quote.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/sotamuluxopofopizagog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a567836-fd33-4c19-865a-75848ae0e2e4/the_art_of_acting_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/4226263250.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/what_is_the_origin_of_the_mashed_potato_powder.pdfIn PDF document text
    • http://sonunetenigido.epizy.com/burururululog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/661513d1-2784-49d0-8f56-addf8adaba48/pride_and_prejudice_2005_full_movie_download_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/932c8166-9006-478b-86a8-6c35b0b3eac7/william_blake_the_chimney_sweeper_songs_of_experience_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad0deeec-bce9-4b0d-a536-96bdb70d52af/54310326199.pdfIn PDF document text
    • http://nupuzawov.onlinewebshop.net/nejud.pdfIn PDF document text
    • http://kofepiropi.onlinewebshop.net/wixokulipusakofeg.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5B 5528 bytes
SHA-256: afaf7bd5694579574eee9f81462999daed0dba3301d18436fcfb8c4c6d924037
font_01_sfnt_off00014144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14144 11260 bytes
SHA-256: 6973380d862b3928ee6e82fe1205f8757ae8818f01461874d37fc3ee76e1e5f9
font_02_sfnt_off000167e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167E2 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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