Malicious PDF — malware analysis report

Static analysis result for SHA-256 056a24ac07beb675…

MALICIOUS

PDF

78.0 KB Created: 2021-09-17 14:36:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 76823ab1e2320714223557663b46bf21 SHA-1: d8452e9ce248bcf0addab28688c7e32dbc93748c SHA-256: 056a24ac07beb6750a878eb13164b0954ccb9b154dc19d74471b1a121c95a519
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or credential harvesting campaign. The PDF structure and the presence of external links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=prokaryotic+vs+eukaryotic+cells+venn+diagram PDF link annotation
    • http://ityab.com/cache/fck_files/file/wimikewezuj.pdfIn PDF document text
    • https://sharkovinkom.com/sharkovinkom.com/ckfinder/userfiles/files/66487545609.pdfIn PDF document text
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/vefogidopix.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/52430591601.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/816832508.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/pajuvozadumawibafutid.pdfIn PDF document text
    • http://stonebreaker.at/49661022840.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/32110067877.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/jenuvinejunagakimivopu.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/19335053857.pdfIn PDF document text
    • http://ashioke.com/images/library/File/74216868997.pdfIn PDF document text
    • http://artospace.com/pics/file/65785304042.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/55159213705.pdfIn PDF document text
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/839501173.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/gotajovavami.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/soterumutelalaj.pdfIn PDF document text
    • http://studioambienteterritorio.it/userfiles/files/24372458522.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d60e426343---13888826570.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/vafimefikowix.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/zepisikuxe.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/20620621450.pdfIn PDF document text
    • https://claudiodituri.it/uploads/gosafoj.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_off0000cb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB58 17548 bytes
SHA-256: 1deb885da9bbfcc16ea8286f5e2c4dac5b3843816fca48e8c2dae7266d219ace
font_01_sfnt_off0000f868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001107f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107F 11088 bytes
SHA-256: 889a03387ff004748bca657bba628e2fc185e2889d83e8396660d54431ddbf9b

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