Malicious PDF — malware analysis report

Static analysis result for SHA-256 7001419d95d99bc6…

MALICIOUS

PDF

71.4 KB Created: 2021-03-19 08:31:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed72792fbf97a183136109a616055321 SHA-1: e1f88b3e746b8a471aec1b24e117c3ef65f9fa18 SHA-256: 7001419d95d99bc6cff8a87c06b3731531d9e663c05cc2c5ecfd375c8994e8e9
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam or phishing lures. The heuristic PDF_SEO_LINK_FARM and the presence of a download button lure suggest a malicious intent to redirect users to potentially harmful content. ClamAV detection as Pdf.Phishing.Trojan further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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/award?keyword=add+text+to+a+pdf+file+online+free
    • http://waludojugemupa.iblogger.org/data_structures_and_algorithms_in_java_solutions_manual.pdf
    • https://static.s123-cdn-static.com/uploads/4392472/normal_5fde99864444d.pdf
    • https://static.s123-cdn-static.com/uploads/4454679/normal_600201849fedc.pdf
    • https://cdn-cms.f-static.net/uploads/4405644/normal_6031586891a23.pdf
    • https://cdn-cms.f-static.net/uploads/4407724/normal_5fdaf762a35b9.pdf
    • https://cdn-cms.f-static.net/uploads/4495385/normal_5fd9b986d2538.pdf
    • https://cdn-cms.f-static.net/uploads/4383565/normal_602932ae494af.pdf
    • https://cdn-cms.f-static.net/uploads/4480591/normal_604453e27955e.pdf
    • https://cdn-cms.f-static.net/uploads/4403271/normal_604dd70ed5341.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c5c0c8ab-8425-4e3f-994d-9b8088be2f48/pamupobutejiwisaneto.pdf
    • http://xunaruxu.rf.gd/76725586658.pdf
    • https://uploads.strikinglycdn.com/files/2a40e0cd-bc2c-4a59-91dc-eaf2bcdb6e49/the_highwayman_by_alfred_noyes_summary.pdf
    • https://s3.amazonaws.com/kavalukato/66277890359.pdf
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_fa0fc26121e74eedb97983db5faa030f.pdf?index=true
    • https://s3.amazonaws.com/vavale/tuzuwu.pdf
    • https://uploads.strikinglycdn.com/files/28a1d2b1-ee61-4088-bc6c-3107cb13cbf9/mean_median_mode_worksheets_word_problems.pdf
    • https://uploads.strikinglycdn.com/files/27642d7f-5998-45e3-bde1-e5633463b7e2/raingutter_regatta_rules_cub_scouts.pdf
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_3ce49c415eb64bd5b3ebb76b21104996.pdf?index=true
    • http://pabipinipimano.epizy.com/36181394670.pdf
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_333f7f8847bf4a7680b205b5b5669f9a.pdf?index=true
    • 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_off0000dc80.bin
2c94a6e8e8b3298b23b536e82e1589ee9f1f6044e8d109361fba3085dd024a3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC80 4912 bytes
font_01_sfnt_off0000ed49.bin
ad1005e7983cd50988fd7469a7969c2e17c2e98eda57b65e85007796dffa4121		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED49 10224 bytes

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