Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a6ab8d40f4e7df…

MALICIOUS

PDF

68.9 KB Created: 2021-09-24 23:08:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4947ff1379950fd30af6a52bf8cc07b0 SHA-1: 5ad8b0a2a8b34fbd774abc46ac923f7900bc64a0 SHA-256: c1a6ab8d40f4e7df93800601050d29ad549fae0d0c18c77ebb87d966cd8d2c10
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and appear to be part of a link farm. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, consistent with callback phishing or tech-support scams. The embedded JavaScript and external links suggest the document is designed to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=popcorn+time+apk+download+2019 PDF link annotation
    • http://dtyxbpzx.com/filespath/files/20210902040245.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/gudaxubituxosusiga.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/13486989959.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///xilimadirowi.pdfIn PDF document text
    • http://ippon.lv/uploads/File/tukukurewavutire.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/68471559748.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/lebifemanabod.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/gegifigugatuvixoroku.pdfIn PDF document text
    • http://sualpturizm.com/userfiles/file/lelebolur.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/zetejimijojola.pdfIn PDF document text
    • http://retailcop.ca/files/pejubokoxigivanobamumuj.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/31922054993.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/popazeselo.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/kajutidinatusimexovoji.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/zowefomexerobe.pdfIn PDF document text
    • https://aarushimukhwas.idealviews.com/userfiles/files/12318013825.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/29299875454.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/8blnup2c1i0gqm8ru4o89979h4/newepawasozaz.pdfIn PDF document text
    • http://sjatupornservices.com/file_media/file_image/file/xijosaruvurozunuxorotar.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/rizifoxasowag.pdfIn PDF document text
    • https://kawanmto.com/contents/files/86642843322.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/58233551066.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2109051517063565927dj06s8ukbhf.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_off0000ad8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD8E 15312 bytes
SHA-256: 4e87b98b0c527e0d35dfacc304ec4d39c7c1f728a7b049c34a04e681ff7079c7
font_01_sfnt_off0000d429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD429 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC40 11148 bytes
SHA-256: 55d31d0c3d6feb0f54725390391139f4ae023bd28f558e8863e713ae88a3edef