Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4a76b3b4b00a09…

MALICIOUS

PDF

81.9 KB Created: 2021-04-27 10:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a8443138724d7366e7c6cc0a261151fe SHA-1: 82f8a9a718de6a9fdad18b4fe485d1592a2340c1 SHA-256: ce4a76b3b4b00a092b071bda3a155d141c3f2372b386eab492697ee90f0b4a1a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score further indicate malicious intent. While no scripts were extracted, the document's structure and embedded URLs point towards a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://botokaw.ru/strik?utm_term=the+end+of+evangelion+movie+poster PDF link annotation
    • http://centerverifybadge.com/the_little_prince_antoine_de_saint_exupery_charactersdcfv3.pdfIn PDF document text
    • http://uptodate.site/58651718454j80ad.pdfIn PDF document text
    • http://creditscoreusa.info/samsung_55_inch_smart_tv_6300_series4f7oq.pdfIn PDF document text
    • https://cdn.sqhk.co/setawigiz/Jhdjehb/gudafiridobuxinalobokik.pdfIn PDF document text
    • http://yachts-4-sale.com/gugegifexibuuicym.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/ja7hiwJ/guitar_recording_sounds_muddy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kaloruligot.onlinewebshop.net/synthse_de_l_acide_sulfurique.pdfIn PDF document text
    • https://s3.amazonaws.com/vuxalirudidel/97221934973.pdfIn PDF document text
    • https://b0cee159-9ce3-47d2-9452-de9e383f1b6b.filesusr.com/ugd/fac5c7_9010823787dc42c28f8d12deba306000.pdf?index=trueIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_2558e57ad261465e81d0935ca8e111b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvarelo/what_is_a_table_of_contents_in_an_essay.pdfIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_1eef95077ced4b0a9201f7b1f34553d2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/anstoss_2005_userfile.pdfIn PDF document text
    • http://kewevagisugimuw.onlinewebshop.net/words_that_start_with_z_for_kids.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/hp_psc_1315_print_without_color_cartridge.pdfIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_b5dbb3f687444b9497cbd4200f3e8243.pdf?index=trueIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_b85429b88c8843fe84f63f35b6c888a2.pdf?index=trueIn PDF document text
    • https://da89e6ec-52f9-4c28-8de8-447a2e923c0c.filesusr.com/ugd/5e5b2a_59be63837d73423ebbc14f04b5d235c6.pdf?index=trueIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_c2f0462a89744bb5b374be7f2db30c6c.pdf?index=trueIn 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_off000102cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CB 5464 bytes
SHA-256: a2e5885781c49d5c9a4b3b1ccd28d9a3d2fca505e54777be21e5818a87da4f62
font_01_sfnt_off00011542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11542 10940 bytes
SHA-256: e9967024edeaa86ebcec78fc3886425088b1163f77e950e37af43628af4e1b67

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