Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a036a8cf9d4585b…

MALICIOUS

PDF

85.7 KB Created: 2021-05-24 07:44:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 62dd621e291add14a1e9a33ffa92f7e1 SHA-1: 1d2072fd7df59fc81c915d776aa7a14abd3c9fab SHA-256: 6a036a8cf9d4585be82faa79139208423491b967ab625796a5cdfe8f9ae9e735
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The embedded URL points to a suspicious domain, likely used for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest an attempt to redirect the user to a malicious site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://zajinet.ru/strik?utm_term=how+to+write+a+fax+cover+sheet+attn PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4419650/normal_6007c7b579f69.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420025/normal_5fe59abe3a96a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365602/normal_605f7fab1a50c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378165/normal_5ffa0f772cdd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404116/normal_5feea505f01e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370996/normal_6048ddd130107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490365/normal_602f5cf2761e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458628/normal_602fd201cc76b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476140/normal_601d8c2f79abb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418963/normal_5fe8e69491861.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497348/normal_602de4dc19fe2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419847/normal_5fefebac38e28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445750/normal_6056472c3b6c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403140/normal_603f4c30b5dc9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/09016d75-ff54-4160-b57e-f529edcecfa6/omron_h3cr-a.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/habibie_ainun_book.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/decimal_to_fraction_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/logitech_harmony_hub_reboot.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/save_in_ascii_format_matlab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50d3bab0-d14d-417d-839f-71cde2e168e6/31556973189.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_off0000fbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 5116 bytes
SHA-256: 9cecf68c02f59d2142c425df5cff41b412cc231f971cca79feffa392040fe768
font_01_sfnt_off00010d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D62 11240 bytes
SHA-256: b38b4fa961aeaeb1025ee15df0ada7a4897707c9a7fadfc8c1262fe47e736ce4
font_02_sfnt_off000133f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F6 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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