Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48f49861757262b…

MALICIOUS

PDF

82.2 KB Created: 2021-09-22 10:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 815d3bfac49d6e1173cd110368e35382 SHA-1: d02e073bac1824c264d9f8a5ad930a377f55eb77 SHA-256: a48f49861757262b14e7dfb0ed8dd2c50a5cd20f6019b1e38783927d2130aaea
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristic analysis indicates it functions as a link farm and contains a callback lure, prompting the user to call a phone number under the guise of resolving a financial or security issue. While no scripts were explicitly extracted, the presence of multiple embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious sites or initiate fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://twozonechickenlasvegas.com/uploads/files/zazuwuforurebix.pdf In PDF document text
    • https://radmangroup-ye.com/rgfiles/file/53696723002.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/9b5c9f61b79b7dcc4f88c0dc6fe2ce01/ragupufoxam.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/tiguxexijagukiritutarugif.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/15632891259.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/48885623316.pdfIn PDF document text
    • https://jjpremiers.com/files/leneni.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/fatud.pdfIn PDF document text
    • https://anfauglir.com/images/file/8483351576.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/49715420017.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/xunimevofavutabe.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/robikatirogenup.pdfIn PDF document text
    • http://teresachild.com/upload/files/towagetafazafi.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/mijifibuvifo.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/rasinutujeliseb.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/10788771481.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/pujabelidodol.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/47375216087.pdfIn PDF document text
    • https://handinhand-daycare.com/ckfinder/userfiles/files/94871916902.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/wutakobawetaforaliso.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/27084986201.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/37802158273.pdfIn PDF document text
    • http://recviem.ru/img/upload/24479480020.pdfIn PDF document text
    • http://ahknchem.com/upload/files/daxedi.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e9379fd77---zifagumeleduralafapamud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=adwords+keyword+tool+freePDF 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_off0000dbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 18420 bytes
SHA-256: 997016fd5c64bad45b9b3bb3db7dae903633e0d1840a63ecc71bf66ca3265f76
font_01_sfnt_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F2 10264 bytes
SHA-256: 807ff341c01b653681f5b4caf0772ef9ef809eb5288ed9fc98e91f4d10477d4c