Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d93d08f16f0686d…

MALICIOUS

PDF

80.9 KB Created: 2021-09-11 16:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6f768b10ed0ef49c74b7dde748620824 SHA-1: 20dbf425f4a53279570d38e20fd9fac4a89fbf8d SHA-256: 9d93d08f16f0686d3742361b19e0b2a7a812563bc5b9ba1b0fd590e20b474d75
154 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits vulnerabilities or attempts to download further payloads. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a malicious phone number. The presence of numerous external URIs, many pointing to disposable domains, further supports a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://www.sistemkabin.com/ckfinder/userfiles/files/20558482907.pdf In PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/semigowugisovixajif.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/45636685478.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/tapofo.pdfIn PDF document text
    • http://frutapacargentina.com/ckfinder/userfiles/files/80320355167.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/votiziwuvejij.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/87116776453.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/75404789154.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/vatelenegunowekujusom.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/8990865657.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f7b0c8db24---zisagu.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/da03f2a886e15be30406054c424e70d8/figevoligabiwepolivolekum.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/neniwisesiliwozibawuziku.pdfIn PDF document text
    • http://www.moyekolodin.com/files/88654608523.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/lunalajixesanutakibizev.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021090704323170554.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/pulati.pdfIn PDF document text
    • https://panoramabyty.cz/content/97239601406.pdfIn PDF document text
    • https://machnhaduong.com/images/uploads/files/jupawejenezibarasegosifew.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/raxavunojepilozimulab.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/vomamadukolitemebexi.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/53425801227.pdfIn PDF document text
    • https://qigoodteam.com/uploads/files/202109051023149615.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/wixudowenowolevikima.pdfIn PDF document text
    • http://rld-carbon.com/file/14357134441.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=double+space+period+androidPDF 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_off0000d7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A4 10652 bytes
SHA-256: 42cbffcbffa98fa1e7d72d7e2c322207738e15b5ad95b26a08a85256e20dee68
font_01_sfnt_off0000efdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107ED 17604 bytes
SHA-256: d3ab3468504bec5bc58b173122bd51ac1b7c925db5a5e270feb978805bc28e70

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