Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ceedfa86a55712…

MALICIOUS

PDF

86.3 KB Created: 2021-09-16 07:12:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c53c68df66547e14c6f15c42458a4d8f SHA-1: 279c98f71a0e22d20dc695e6855c264b9feca82a SHA-256: a1ceedfa86a557128a5b30fd0f90a0d441c3957fa3c0c232f837d148a2f3b6c4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV heuristic strongly indicate this PDF is malicious. The 'SE_CALLBACK_LURE' heuristic confirms the document's intent to trick users into calling a fraudulent phone number, typical of tech-support scams or callback phishing. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs suggest it is designed to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://tepatsasaran.com/contents/files/10546508203.pdf In PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/nezuliv.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/7975110323.pdfIn PDF document text
    • http://kahasat.cz/data/file/73635149872.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/26514912387.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/mogitogomejuvijaropil.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/wozasusina.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/22216958690.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/kazenuti.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/vozejegumovok.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/44732652872.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/29662490999.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/35710225160.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/19216744820.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/6583670d91b567e170d98e0983da5519/22991112167.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/fuduxepata.pdfIn PDF document text
    • https://rintrans.com/files/wirobewodizefuxibuvarebiz.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/8895676227.pdfIn PDF document text
    • https://dalba.net/other_files/File/tivukixipujujanobateso.pdfIn PDF document text
    • http://willbramephotography.com/32965945606.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/70956950472.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/39911809128.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/jigokebuxuzesivuvewew.pdfIn PDF document text
    • http://uhorder.com/upload/files/wifuponetapawex.pdfIn PDF document text
    • http://megalaserasia.com/upload///jadekapineguvisaziwatum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=android+not+receiving+text+from+iphonePDF 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_off0000e9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B7 10840 bytes
SHA-256: 16bd0296c4dbaeee8cfc10f8aed35882d777e06e78ce3dca373baedbc5a067ce
font_01_sfnt_off00010252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10252 18912 bytes
SHA-256: f01795d1b730017f6ed4fb5c113c02b0ccfa9a320a644020aea70ced367dda5c
font_02_sfnt_off0001333a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1333A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1