Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff302fe509434fb5…

MALICIOUS

PDF

78.1 KB Created: 2021-09-19 01:15:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a5e09c216544a77f5e8a3e356f5bd652 SHA-1: 5e7b91b35c27ebc7859995cecf401c1f2239321e SHA-256: ff302fe509434fb5be44d16bbd211d7ac1ae92366c17c47bf69905cb04aec414
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF structure and the presence of external links align with the Spearphishing Attachment technique, as it likely arrived as an email attachment to trick users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=merk+hp+android+terbaik+2015 PDF link annotation
    • http://fatfailogistics.com/fckeditor/files/file/terasa.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/10331664012.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/86761293728.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/vinog.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/61254143308.pdfIn PDF document text
    • http://speckrepej.com/upload/file/26536819132.pdfIn PDF document text
    • http://rayer.cn/d/files/21458243830.pdfIn PDF document text
    • http://coolscape.info/images/files/lusojiliror.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/wifazawaxezezusilas.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/070614232120.pdfIn PDF document text
    • http://bxbrdh.marketsearching.com/upload/files/jebenefutisokunarodojub.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/15f919291ead94267411131428a0e003/23397696750.pdfIn PDF document text
    • https://artgallery.devctn.com/ckfinder/userfiles/files/fapepixakujogenabobi.pdfIn PDF document text
    • http://babyshelter.net/assets/upload/files/37558622366.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/vovigebuvorafasiwoxipa.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139c04e9b847---72839720551.pdfIn PDF document text
    • https://hgb.se/filer/file/negogisibalar.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/gidumixatozili.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/41512977118.pdfIn PDF document text
    • http://www.ville-dammarie.com/ckfinder/userfiles/files/nulevegobisuxi.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/wujawederimariroluseluso.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210914075337.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_off0000cfab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFAB 10928 bytes
SHA-256: 85405f4c1cb7a30a8ed428e1cb02a9e134aec83b7cbd2e0c4accffc135fb97df
font_01_sfnt_off0000e8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C5 16364 bytes
SHA-256: 512beaf38b0434f660d1f3a61ff4ae2158eb6709bf78eff499b13c03ac012604
font_02_sfnt_off0001130b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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