Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c149e867f6c5f0…

MALICIOUS

PDF

74.3 KB Created: 2021-09-17 03:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: cd5eb2e7b6321da1c02516147771c3e0 SHA-1: e31ac70d0214b79f32d129c88c4846c799f4153e SHA-256: 80c149e867f6c5f01b21c41e678edc8d3577542e1d245464ea48c794a5636b7c
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to execute malicious code or redirect the user to a phishing site. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a number. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://reclamesticker.nl/images/uploads/file/ In PDF document text
    • http://flemingdecal.com/uploads/assets/file/xinim.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/foluv.pdfIn PDF document text
    • http://kompassztuki.pl/Image/files/zeluxepewufoliriwapukujaf.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/63511660016.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/rufowiwojon.pdfIn PDF document text
    • http://szpitalstrzelin.pl/userfiles/files/45390235813.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/sezudep.pdfIn PDF document text
    • http://umbabox.com/userfiles/file/28155328384.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/kijovoragazukakuzowu.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/jakiguzufalamawirezire.pdfIn PDF document text
    • https://muachungbaohiem.com/uploads/userfiles/file/65536049234.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69181870725.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/zuwemodokarewesinote.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/soninuno.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/mevojejeseteb.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/54159152987.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210910_021F3C7E6BCFEB68.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/wugolimezazimalidojalefu.pdfIn PDF document text
    • https://tanhoaphat.vn/userfiles/file/6285630189.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/29933764061.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/47261177679.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/58645264098.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=gta+5+cheats+pc+lose+copsPDF 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_off0000bf55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF55 10348 bytes
SHA-256: 49b1ec057583a868adfae089170a10c6fcfebb910ac450765fc1756c71e5d2bd
font_01_sfnt_off0000d6f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F5 17300 bytes
SHA-256: 2b480ce8bc61bffdfda7afccd11315dfb340184edc34a55370e4cfca426547cb
font_02_sfnt_off000103c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1