Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4a5b7c66b28c2c…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 19:43:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e54f57633fb3005dfc238f396734940b SHA-1: 0e82e75df1321d702e08cb4ed4d790921c66dde1 SHA-256: 7c4a5b7c66b28c2ca2378c4ea8f088b85e558ef2f2cf3374e7a72c6a67988ecd
166 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The presence of a fake CAPTCHA heuristic suggests a social engineering tactic to prompt user interaction, likely leading to the download of a second-stage payload from one of the embedded URLs. The document body is heavily obfuscated, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • 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://drafthe.ru/uplcv?utm_term=download+let%27s+go+pikachu+for+android PDF link annotation
    • http://pillshop.ru/uimg/files/tenitiw.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/48628114928.pdfIn PDF document text
    • https://best-label.com/upload/files/xuzalowekafiletewapija.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/fimixoxefaronuxiwenifoxu.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/zixifezo.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/dewotemefujewizanoworu.pdfIn PDF document text
    • https://o2opr.co/userfiles/files/49479154492.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/marogexakid.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/tubupetukasimosiginuke.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/gusegodalafilavade.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/tapirek.pdfIn PDF document text
    • https://j26clean.com/upload/files/gezifofune.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/42546770891.pdfIn PDF document text
    • https://grupa-energia.pl/attachments/file/98501306081.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/fimobuwexoxexak.pdfIn PDF document text
    • http://tko.wavedev.net/img/files/files/dizamopovarube.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/tumegufinewevurebo.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/zegugifejaw.pdfIn PDF document text
    • http://sparkpro.lv/content/file/gufulu.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/13650522962.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/68475217053.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140263613338---mubevasugujevimotuwu.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/xelopibaxuzerisufonid.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/sixavavil.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_off0000dec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC8 18560 bytes
SHA-256: f900a02d32ce9bb5611bd5a697c9de12a133c3f7dc7eb25bf695550b68a82240
font_01_sfnt_off00010ebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000126d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D4 11212 bytes
SHA-256: d774771463dbd304350271a01f821caaf7d8e4ba271641a4d3195965f0ae655c