Malicious PDF — malware analysis report

Static analysis result for SHA-256 0523eddc423c4a28…

MALICIOUS

PDF

80.1 KB Created: 2021-09-17 21:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7f7d89fb7e2a2541c8e1b560ce238e4b SHA-1: c2def29fdd8054bc7df430090fb00e2cb1d39c1e SHA-256: 0523eddc423c4a283a316bedb0db6d5b50182a2d14be8a5d0fb48d8f7a28fba9
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by a machine learning classifier and ClamAV. The heuristic 'SE_CALLBACK_LURE' indicates the document likely attempts to trick the user into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were directly extracted, the PDF structure and numerous embedded URLs suggest it is designed to lead the user to malicious content or services.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://superlitefan.com/uploads/files/rifajupor.pdf In PDF document text
    • http://netinflux.net/userfiles/file/lonovugalo.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/xotapijedonipekorekel.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/24294734123.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/6998017846.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/towidewosapodusaji.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/17289215430.pdfIn PDF document text
    • http://ferien-in-zahren.de/images/file/82690349868.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/86336907615.pdfIn PDF document text
    • http://lovesenergy.nl/file/58774863373.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/98849843556.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/35552357652.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/6338143129.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/nulitinazobeju.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/5150006272.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/60285655518.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/talemifuna.pdfIn PDF document text
    • https://thailonghoang.vn/upload/files/35783235612.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/37485874941.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/89332297066.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/gujazo.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/nawomuwasepujitaf.pdfIn PDF document text
    • https://businesslife.com/content/file/14223869689.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/41679978087.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=descargar+juego+call+of+duty+para+androidPDF 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_off0000d1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EF 18052 bytes
SHA-256: ee5c6ea9e1e74c0db3fdb140f6cad7b50ad743c3c6a007d02bfaab5cc8a1049f
font_01_sfnt_off000100ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C3 11140 bytes
SHA-256: 70616d8bce871b6a073f566ad49ac46f090af10ebf63302c609e7aaa93e3b759