Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd6d5cf78158ea3b…

MALICIOUS

PDF

84.6 KB Created: 2021-11-12 17:48:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2efe1079821cc10d97635ab147acbdc3 SHA-1: f834d998cce6c9a480b1eee605afb6f77291de61 SHA-256: cd6d5cf78158ea3b618e19a9be5216942eaa5e215327aea75db2355595219061
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, indicating it functions as a link farm. Heuristics suggest this is a phishing or malware distribution lure, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged it as malicious. Although no scripts were explicitly extracted, the nature of the embedded links and the heuristic findings point towards an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://philabc.ru/uplcv?utm_term=4+letter+words+ending+in+x PDF link annotation
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16174c0418b2c9---zegupiruzevenuku.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/47607511113.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vuloposij.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/19321218681.pdfIn PDF document text
    • https://baptistfriends.org/media/95378179218.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/60071928784.pdfIn PDF document text
    • https://camelcarpet.org/d/files/solizowo.pdfIn PDF document text
    • https://benmoonpharma.com/userfiles/file/9980721206.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/gofevonorimefojezukinan.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/20499344291.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/kutasinivejomemedisu.pdfIn PDF document text
    • http://edbiji.com/uploads/files/20210918072306_725168.pdfIn PDF document text
    • http://bingsu.ir/cache/fck_files/file/gotafifakavofo.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1617cac9168546---worefozababezunesilep.pdfIn PDF document text
    • http://ambcavallon.eu/userfiles/files/27073691472.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/56824836532.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/lugedopenuvefazidoneda.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/mepuki.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/9649566401.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/vuduzawavenes.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-10-20/20211020225812404520.pdfIn PDF document text
    • https://fishuntpesca.it/file/85365664295.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/kotod.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/62092377479.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/bukixopaje.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_off0000e59f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59F 10428 bytes
SHA-256: 90edeffb0097a4bfb5e1d6175aa8485fb2d1a06ae5bbdeaa312250e646ff78b2
font_01_sfnt_off0000fd33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD33 18556 bytes
SHA-256: 461277a11a4a48067c9ada2b7dfa476b272b26cf2f38f5e4b673d4439907c256
font_02_sfnt_off00012da6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA6 16540 bytes
SHA-256: 45015263e28dbf00792e0fa83ae0fb9123af5110209f191c00797c49350166ef

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