Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca8e33836514b41…

MALICIOUS

PDF

75.8 KB Created: 2021-05-20 03:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 251090401ce6f0ae69b836d252a4999c SHA-1: 7ab0b45f327d5de081fe8c490ab37033f9dd3549 SHA-256: 0ca8e33836514b417b58e9ab3e22f4ee8db12e9314138fbbc7a71bf934ab7c76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, with a significant number pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_URI' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing trojan. The document body, though heavily obfuscated, contains references to 'Microsoft flight simulator 2020 online multiplayer' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=microsoft+flight+simulator+2020+online+multiplayer PDF link annotation
    • https://bosudire.weebly.com/uploads/1/3/4/4/134456289/7157397.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377935/normal_602c1eb4a649f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386094/normal_6014d1a961dc2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463262/normal_603f0f8b12fce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393791/normal_6063d87c17474.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391024/normal_60028a6f1fe5d.pdfIn PDF document text
    • https://tetavezodumop.weebly.com/uploads/1/3/4/6/134645623/lupebuxulago_livov_dulajinik_nefemo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380379/normal_606ad8236df7d.pdfIn PDF document text
    • https://segoponozumi.weebly.com/uploads/1/3/4/0/134000249/mozudivob-rasagizusufejog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454287/normal_606122e094247.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421050/normal_606d8bfd756e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465556/normal_5fd3d97ac9b60.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/edad4a20-72ce-4108-aa63-5a2e5eeeec50/basic_crochet_patterns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff0bc274-3712-43b5-b55c-822ef3b8c43d/kineleriw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/749c7087-775d-4cbb-8b31-fe49e4237625/lofaxunadipexuzuvatisiboz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea9ca283-9a6f-442c-9add-53d89c3226e5/99072006662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d26be9e9-129d-408a-8973-d546c93e1dca/kindle_paperwhite_users_guide_3rd_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de782cfd-749c-4083-914f-e2959a631408/bass_guitar_notes_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c84029d-36a5-414f-a712-64f61095ee81/zesobowopiza.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95D 5808 bytes
SHA-256: 87dba37ec455267da8f66a27a83a005c4dfa98e43a578f9db6a1944ade22767d
font_01_sfnt_off0000fd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD10 10776 bytes
SHA-256: 510e6fc4aa2ad0d6198c3541a1c76f6f0ded515d1a7b664b1b658e198b426f02

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