Malicious PDF — malware analysis report

Static analysis result for SHA-256 00ad8a552790c2eb…

MALICIOUS

PDF

95.6 KB Created: 2021-02-12 16:09:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 3af17a643a3995d42f804f9e236845ca SHA-1: ffc3f72092a095757e07bbe035143d412abd14b5 SHA-256: 00ad8a552790c2ebfc305025effadfa6daf491b642e60b2b7308c0971e8094f0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including one pointing to a link farm on disposable hosting, suggests an attempt to distribute or redirect to malicious content. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a keyword that could be part of a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bologen.ru/wix?keyword=workshop+statistics+discovery+with+data+4th+edition+answer+key PDF link annotation
    • http://albatros-trans.ru/fobawigefuluvadonitupiqn5o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485153/normal_5fdfaf28ec3ae.pdfIn PDF document text
    • http://sidesevofexow.22web.org/new_amsterdam_season_3_episode_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_5fe82101903f7.pdfIn PDF document text
    • http://hotita.fun/jabomorewodadn85q.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/o3C9jcq/photo_editor_for_android_tablet.pdfIn PDF document text
    • https://cdn.sqhk.co/bibilofefi/qsgjihS/200872219.pdfIn PDF document text
    • http://gutprod.xyz/cutting-edge_cabinetmaking6tmqr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418368/normal_5fcda5c51b738.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vogojitipam.epizy.com/3d_models_obj_free.pdfIn PDF document text
    • http://jugejojejaf.epizy.com/rotemokolatitalareke.pdfIn PDF document text
    • http://gubadix.epizy.com/rulunasagixemonejujeg.pdfIn PDF document text
    • http://gadojir.rf.gd/introduction_to_automata_and_language_theory.pdfIn PDF document text
    • http://jixenefotudak.epizy.com/hey_there_delilah_sheet_music_guitar.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13622 5548 bytes
SHA-256: e42cf5e0663e327d49e8ade6e643386453f78d006f325a320e8ff83dff67289a
font_01_sfnt_off00014925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14925 11812 bytes
SHA-256: 50b9198dfb67df5ade1fd80cddc973922b09366b58288d83df31f0357d2e8bf9

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