Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3f62953134a3f08…

MALICIOUS

PDF

84.1 KB Created: 2021-09-14 09:53:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c7ec549d735241b961778cb0ff35d167 SHA-1: 11c1d686520ee017be6820b836c094c6eddeb45f SHA-256: f3f62953134a3f08cbbaef60988a8ce6e6cc6043f78d68b2c8756fd6c8c16523
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1559.001 Component Object Model Hijacking

The PDF contains numerous links to other PDFs, suggesting it is part of a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document may be attempting to trick users into calling a fraudulent support number. ClamAV detection and ML classification confirm the malicious nature of the file, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/23995049786.pdf In PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/76658527193.pdfIn PDF document text
    • http://special-pharma.com/upload/files/25684460470.pdfIn PDF document text
    • http://colafranceschi.it/userfiles/files/jarivuxipuwunep.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133ab0eb3156---38854713104.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/winix.pdfIn PDF document text
    • http://qdjshg.com/files/file/boborudibitizi.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/88194783628.pdfIn PDF document text
    • http://avanti-kuhni.ru/upload/files/melijopibot.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/kagibe.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/43052584355.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/17777822147.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/zejejov.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/84433072640.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/bimaket.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/xafepimedejumavolujafu.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/puvutusinerek.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/20938038168.pdfIn PDF document text
    • http://kmsenior.org/file/files/webizerepanukufifim.pdfIn PDF document text
    • https://satesayap.com/contents/files/43773060760.pdfIn PDF document text
    • https://marbletreasures.com/uploads/image/files/32617347816.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/wixatipodevit.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/dowubifa.pdfIn PDF document text
    • http://eubeer.vn/uploads/files/97991737321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=download+papa%27s+wingeria+apkPDF link annotation
    • 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_off0000df57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF57 19216 bytes
SHA-256: 362280ab5ce201d5648d3cebe011e7a88c267347f4e1eb05bfc00d7e1ddb421e
font_01_sfnt_off0001127d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127D 10680 bytes
SHA-256: 607ab70a65bef79b2040329bc7db14a6ef2f65fa4dda3ee0795d684b0ed3ad29
font_02_sfnt_off00012af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1