Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d07d941c285f91…

MALICIOUS

PDF

103.9 KB Created: 2021-02-10 18:07:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ceac9611452610fc4e5d59c8e28b44a1 SHA-1: 2d72a16eb5890a1791a3cf2f3227f585724ac501 SHA-256: b4d07d941c285f9144dd4cb18df4eb9cafecb19cc9938b97ba526cf9d014bc3d
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a ML classifier and ClamAV. It contains a large number of external links, suggesting a link farm or phishing attempt. The 'Clipboard command execution lure' heuristic indicates the document instructs the user to copy and paste content into a shell, a common technique for executing malicious commands. The presence of multiple external URLs, including suspicious ones like jottigo.ru and jotupati.22web.org, further supports a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jottigo.ru/aws?utm_term=cimb+principal+iprop+factsheet PDF link annotation
    • http://jotupati.22web.org/bowikilunonobazobeg.pdfIn PDF document text
    • https://basalolevezuw.weebly.com/uploads/1/3/1/6/131606508/5934647.pdfIn PDF document text
    • https://xopilujipuwoka.weebly.com/uploads/1/3/4/8/134886601/1448623.pdfIn PDF document text
    • https://seruborakumew.weebly.com/uploads/1/3/4/8/134849990/juluz.pdfIn PDF document text
    • http://vududodudo.22web.org/jusisugib.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kunaraxanoxun.epizy.com/rumozopedetemetop.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/likanu.pdfIn PDF document text
    • https://s3.amazonaws.com/xasovewipeje/tetakoju.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/service_provider_agreement_template.pdfIn PDF document text
    • https://s3.amazonaws.com/retobifulipo/pezobatemamumuvalafope.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/sisunerasasifibala.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/bike_blast_rush_game.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/ayushman_bharat_yojana_form_up.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/avg_antivirus_apk_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/daraniwekamidir/midisipogega.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/jegivujo.pdfIn PDF document text
    • https://s3.amazonaws.com/towakog/jixizagukupukebijopesado.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/cecily_smith_fly_by_night_sheet_music.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off000133df.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x133DF 10424 bytes
SHA-256: 0c1ad3fdb86bd64967093650de6844379ff933f3ff5f1b5616a92ae79b8d2b18
font_00_sfnt_off0001198e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198E 5300 bytes
SHA-256: 45a8a44c6cd4176615cc2ebdca247544aa80ce04795d604fde7ceb7515e1635c
font_01_sfnt_off00012b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B5B 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_03_sfnt_off00015116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15116 11220 bytes
SHA-256: 0c12e0e01eaa6d406f633c99640153da1f233f9c05c7452b937c9c93822f40e5
font_04_sfnt_off0001776b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1776B 16860 bytes
SHA-256: 001c2919e686782cc6c57057024077f3eb6abc35999023b2df998c82a23ba71a

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