Malicious PDF — malware analysis report

Static analysis result for SHA-256 49af3364abddd7de…

MALICIOUS

PDF

78.8 KB Created: 2021-02-10 02:59:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: d02afcad21230f251170474327c86d24 SHA-1: 26959b45b14bf6c280168b1f71c173948d04e48e SHA-256: 49af3364abddd7de280e41b4f555001069d53967d70fe40494d3a7a6182faff2
222 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting an attempt to create a link farm for SEO manipulation or to host malicious content. The presence of a download button lure further supports a malicious intent, likely to redirect users to phishing or malware sites.

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
  • 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 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.
  • 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
  • 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://yafferge.ru/aws?utm_term=cbse.+nic.+in+datesheet+class+10+2019 In PDF document text
    • http://rewita.fun/beauty_and_the_beast_piano_sheetiyyv6.pdfIn PDF document text
    • http://rewita.fun/luzufob5yadi.pdfIn PDF document text
    • https://cdn.sqhk.co/laxefotogulo/QiaBixe/38445073235.pdfIn PDF document text
    • https://jovinafunen.weebly.com/uploads/1/3/2/6/132695325/351514c79c6.pdfIn PDF document text
    • http://tonagruz.ru/command_and_conquer_generals_2_freedg5bj.pdfIn PDF document text
    • http://begemotiks.space/7430291191dbusd.pdfIn PDF document text
    • http://artdebug.site/experiment_1_fermentation_by_yeast_data_tables_table_1_yeast_fermentation_dataglm7c.pdfIn PDF document text
    • http://questotzvezd.space/cbse_class_10_english_grammar_practi9b9r1.pdfIn PDF document text
    • http://rewita.fun/73795283852v0jbk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/fatisake/axa_annual_report_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/86180266416.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/riverdale_season_2_episode_3_parents_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/39185800474.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 5488 bytes
SHA-256: 70f9400310dba0173450ae3d00e792825f5df5966bb7e97bf47738f1bba5f201
font_01_sfnt_off0000f466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF466 12520 bytes
SHA-256: 0aed6cef45093914f942abbb82812368ae83c08df36baa3469d68937fef758dc
font_02_sfnt_off00011c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C65 4184 bytes
SHA-256: f3a0b22bb960fb2c5cc9ef7988ae84b3238b68435f995ca6b525f7038e8e36ac

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