Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4f047817960335…

MALICIOUS

PDF

76.5 KB Created: 2021-09-20 19:32:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87da26a6219999899c04c33924cdfa3d SHA-1: 35ddd973e31955c6004bd3329064a47466bfceb4 SHA-256: cc4f04781796033566cebc4016ebe6da8f37b0be08d1f5343186068cee83c24d
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a callback lure, suggesting a social engineering attack. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attempt designed to trick users into initiating contact with the attacker.

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://hanasushichoice.com/uploads/files/jabugezewonita.pdf In PDF document text
    • https://aquarell.ro/userfiles/file/49098044541.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/wufifowipebonurelika.pdfIn PDF document text
    • http://pastoret.it/userfiles/files/88291908121.pdfIn PDF document text
    • https://kolkataangikar.org/ckfinder/userfiles/files/94646120744.pdfIn PDF document text
    • https://successalpha.team/upload/files/27961327766.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/85407606155.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/30377695427.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/didizigatutobasokodofeso.pdfIn PDF document text
    • http://ronaldtan.nl/images/photo/juwegikosikupavexomejusog.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/76031531390.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/84686372243.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/98747102200.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/tipomavipuxonulenijoki.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/70565312263.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/revefa.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210910185305.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/80f71f6423f18803ea3e073828d9b6c2/87811516107.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/tekamegaxezejarewoko.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/vapugonujupibifotuveli.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/ribazurizuwiselotigod.pdfIn PDF document text
    • http://etnorom.hu/pictures/56995111532.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/40134655920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sonnerie+android+smsPDF 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_off0000c782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC782 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 10340 bytes
SHA-256: 83cdc02536565fe184bb8a6260df0a914f2cb576370f313d61429c9603faf511
font_02_sfnt_off0000f6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 17840 bytes
SHA-256: 08d58170acc8f60447881f98c93356567cd264342debc94290498e96b3adb2a1