Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e05a797cdbfc01…

MALICIOUS

PDF

78.8 KB Created: 2021-04-02 06:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 4de3aec16fbdc93d2358f709901519d8 SHA-1: 62f715ebe3043183b023887fe846620669ba445a SHA-256: 33e05a797cdbfc01e1d1cd41eb0d7f04269d3402a229ad6e5b22281a2572701c
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a large number of links to other PDFs. The document body, though heavily obfuscated, contains text related to a 'Dayton 100 amp arc welder manual', likely a lure. The presence of ClamAV detection and ML classification strongly suggests malicious intent, likely related to phishing or SEO spam to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://jacksth.ru/wix?keyword=dayton+100+amp+arc+welder+manual PDF link annotation
    • http://zozitaze.mypressonline.com/xegew.pdfIn PDF document text
    • https://vowabogebem.weebly.com/uploads/1/3/0/7/130775978/7751788.pdfIn PDF document text
    • https://pazomanu.weebly.com/uploads/1/3/1/0/131069777/kifogexogu.pdfIn PDF document text
    • http://vetapako.22web.org/mht_cet_admit_card_2020_download.pdfIn PDF document text
    • http://vufiwopader.medianewsonline.com/sagifegixanuru.pdfIn PDF document text
    • https://foboxujegi.weebly.com/uploads/1/3/4/6/134694162/6413139.pdfIn PDF document text
    • http://wimazosuwoxugij.66ghz.com/bjcp_guidelines_double_ipa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zonebon/74100024754.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/nofilo.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/gokotofenuturatu.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/nc_lien_release_template.pdfIn PDF document text
    • http://guriseb.myartsonline.com/bermuda_bus_schedule_2020.pdfIn PDF document text
    • http://biwewija.rf.gd/1884914165.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/the_psychology_of_winning_barnes_and_noble.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/xujumeni.pdfIn PDF document text
    • http://zulojijokonox.rf.gd/77515791718.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/oreck_xl_parts_list.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/practical_tableau_free_download.pdfIn PDF document text
    • http://gogibesu.rf.gd/candy_to_word_convertor.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/1686757020.pdfIn PDF document text
    • https://s3.amazonaws.com/mipeboro/16655393343.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/fogofux.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDB 5428 bytes
SHA-256: 17d51397744bcbd2f27626f6b17f44f296a37121d5b94e2ed986b800e04635ce
font_01_sfnt_off0000ef59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF59 11872 bytes
SHA-256: 70d2b72f3623c343a185c0811ce31ec780f9a7736784121b9b5118f0636d6f19
font_02_sfnt_off00011815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11815 16248 bytes
SHA-256: c89cd4610e7ad6cabf04f9876a36b22b5c31ae53dba02aeaa1b4677657537330

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