Malicious PDF — malware analysis report

Static analysis result for SHA-256 d26aaf717c26f4d2…

MALICIOUS

PDF

71.6 KB Created: 2021-02-25 05:42:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 4e41e54fd276642d6073c6df33a9fe99 SHA-1: 0f24f37053f08b43c93c8677e71dc3207b3eb919 SHA-256: d26aaf717c26f4d24d008c838ca05b80db195abc209397e03af2e0f43397cfab
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains a title related to a common search query, suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=why+isn%2527t+my+dishwasher+draining+all+the+way In PDF document text
    • http://fitokaps.xyz/brighthouse_tv_guide_kissimmeevnbqz.pdfIn PDF document text
    • https://wazalitewisoka.weebly.com/uploads/1/3/5/9/135960923/e80a8.pdfIn PDF document text
    • http://atlas-copco.su/vetivowosolebepeg1xydi.pdfIn PDF document text
    • https://tepupareta.weebly.com/uploads/1/3/0/8/130814680/maramezetileboterugo.pdfIn PDF document text
    • https://xexalidifiso.weebly.com/uploads/1/3/4/6/134685587/305bb13bdb5.pdfIn PDF document text
    • http://creditreportfast.info/cute_baby_goat_jumping_videoecoyx.pdfIn PDF document text
    • http://1xbet-regi.site/31550592942q3zky.pdfIn PDF document text
    • http://vashe-zdorovie.xyz/dewaneteuoo0l.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/iREEIa4/purple_glitter_wallpaper_for_walls.pdfIn PDF document text
    • http://options.expert/shared_mailbox_permissions_reportrlwcw.pdfIn PDF document text
    • https://cdn.sqhk.co/vixukose/eVidsib/15376700534.pdfIn PDF document text
    • http://italywow.pro/611193738686ctsm.pdfIn PDF document text
    • http://mamajan.space/29625241701s40in.pdfIn PDF document text
    • https://cdn.sqhk.co/kepigofunet/GgjPijr/name_generator_5ed.pdfIn PDF document text
    • https://sunivisoxeban.weebly.com/uploads/1/3/4/4/134493344/8854978.pdfIn PDF document text
    • https://cdn.sqhk.co/gigijuke/Ismgd8y/dulakemalojilo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wugujub.onlinewebshop.net/36560929072.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/ender_3_pro_assembly_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/bejeweled_2_apk_mod.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_off0000dbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCC 5480 bytes
SHA-256: 8edfcf94441297886b5a93912bbab2d63e2aa89118bcc60b7a275e7e17f0db3d
font_01_sfnt_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 9968 bytes
SHA-256: dcfab1f4bb8c174d9b097db96c1a3e1b66044e3c82d104ec4fb21b0758a7671c

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