Malicious PDF — malware analysis report

Static analysis result for SHA-256 d428c55dbb713a34…

MALICIOUS

PDF

77.1 KB Created: 2021-02-21 15:36:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c60163924b2f928deac6b826dc03cd63 SHA-1: 40a21ec3d9f94e05f8493018b9685ee91c18fd06 SHA-256: d428c55dbb713a34c3eaaeead0124bd3b56f936bf6c63d3e11c7ce13f36d6031
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. The document contains a large number of external links, many pointing to PDFs hosted on various domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external URIs indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/wix?keyword=blank+volleyball+stat+sheets
    • https://cdn.sqhk.co/fekigimuzib/9iejdii/amazon_fire_stick_mirroring_iphone_11.pdf
    • https://cdn-cms.f-static.net/uploads/4452161/normal_5fe7718f7a929.pdf
    • https://cdn.sqhk.co/fabupiguboxa/idEgi7L/15589093536.pdf
    • https://static.s123-cdn-static.com/uploads/4453730/normal_5fe2fc11922dd.pdf
    • https://cdn.sqhk.co/kugefiruxat/jjcflib/what_time_do_braves_and_dodgers_play_today.pdf
    • https://rijevolokawuja.weebly.com/uploads/1/3/4/6/134661742/xanavup.pdf
    • https://cdn.sqhk.co/karapazepot/ghXk7gd/ncert_solutions_for_class_9th_science_chapter_14.pdf
    • https://dutosagow.weebly.com/uploads/1/3/0/7/130775111/34cc6.pdf
    • https://cdn.sqhk.co/javeduner/ibqj3ib/business_management_and_administration_degree_jobs.pdf
    • https://cdn.sqhk.co/nogorodizet/epSjgO3/assembly_line_justice_happens_when.pdf
    • https://cdn.sqhk.co/vipujitebiki/hchdmih/41668075717.pdf
    • https://cdn.sqhk.co/notenirikev/iggeid8/baxivix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/safenalavojuwu/caldera_peisa_unica_mini_manual.pdf
    • https://s3.amazonaws.com/purufiz/vivavideo_pro_video_editor_apk_free.pdf
    • https://s3.amazonaws.com/wupiwupiwot/72651886641.pdf
    • https://s3.amazonaws.com/gimufesajo/bulavuxas.pdf
    • https://s3.amazonaws.com/forupokisip/75597624100.pdf
    • https://s3.amazonaws.com/dudurat/face_sheet_mask_everyday.pdf
    • https://s3.amazonaws.com/wujafivabipo/21860497258.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ab.bin
e43e352a017cdd3b4a58d0cad430988c5a6e0fc3e8909fae30ee27883f68660b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 5092 bytes
font_01_sfnt_off00010208.bin
7256f999bc9f4fe0729f698c9db5e0582e94047592eb8233a3f0fc30a9094dd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10208 10796 bytes

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