Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad4ad9dddeca40d6…

MALICIOUS

PDF

67.8 KB Created: 2021-09-28 12:59:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2e37bf9879bd678c922715e0db203fa5 SHA-1: a5eba4e70e613e0c75c4610217ef5567ffd4fb41 SHA-256: ad4ad9dddeca40d65078493bde8e5d562e4570974e2ed49de5325e3597cb19d8
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious phishing content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to prompt the user to make a phone call, a common tactic in callback phishing and tech-support scams. While no scripts were directly extracted, the PDF structure and numerous external URLs suggest it is part of a larger phishing infrastructure, likely intended to deliver further malicious content or collect user information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nomylo.ru/uplcv?utm_term=12+muscle+groups PDF link annotation
    • http://iscelenie.info/files/file/sikuzijutetapumefuf.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///sopevesofumekilatunewoki.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/kakediwonopi.pdfIn PDF document text
    • https://pincodehub.in/userfiles/file/98790553034.pdfIn PDF document text
    • http://xn----7sbbbizu2bxaod.xn--p1ai/userfiles/file/duwagibufejidame.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/roxasuf.pdfIn PDF document text
    • http://congseng.com/uploadfile/files/73775899341.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/bavuxifadira.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/tabadimajaxedajefes.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/memixobeliludafatigu.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/9398653590.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/bomugojokel.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210914151734.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/tufebatonokovaladuvewuk.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/jazurukebovezep.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/35764947866.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///donepawibukogemenogokaz.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/lesaxuvupapizovubobovur.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/vulilaxotezipepuxoxu.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/53844730269.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://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_off0000aa61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA61 15932 bytes
SHA-256: d80672c1e51d09bc6ed94adefe304908cdd3ccabddd034e7c7e56dc8ede1721e
font_01_sfnt_off0000d29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB5 10436 bytes
SHA-256: 3206a760e07a02c27ea1aee42e94aa82c06dacbc685d47d7baa4f53fe13fd55d

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