Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16bb89885404743…

MALICIOUS

PDF

74.0 KB Created: 2021-03-05 07:53:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6dcd4b8e1751dbd29af63d8ec9d23dab SHA-1: b4d21469a221af2724befbd2a7a75b5b45ff0d4d SHA-256: b16bb8988540474322828c9ebd89371e37f5b9371f3c7c8487dacbfa9e641534
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, identified by heuristics and a machine learning classifier as malicious. The document body, though heavily obfuscated, contains keywords related to 'facebook apk dark mode', suggesting a phishing or social engineering lure. The presence of multiple unknown URLs further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jacksth.ru/wix?keyword=facebook+apk+dark+mode PDF link annotation
    • http://motarojetox.sportsontheweb.net/79744185343.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460232/normal_5fde9dfe706f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383136/normal_601c9df54ec36.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/spinoza_ethics_latin.pdfIn PDF document text
    • http://xinuvaro.sportsontheweb.net/n1996_motherboard_layout.pdfIn PDF document text
    • https://wuwogijate.weebly.com/uploads/1/3/4/8/134886767/83c68e2c03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388293/normal_5ff144b72b77f.pdfIn PDF document text
    • http://sijemogezabusa.sportsontheweb.net/renikokorafijuriso.pdfIn PDF document text
    • http://xugaguf.mypressonline.com/29180560953.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/daxonajaburaludevumukonez.pdfIn PDF document text
    • https://bovaromekefa.weebly.com/uploads/1/3/4/4/134403346/6787974.pdfIn PDF document text
    • https://zogazakuf.weebly.com/uploads/1/3/1/6/131636678/e88df1bb463ef1.pdfIn PDF document text
    • https://mixutexevegov.weebly.com/uploads/1/3/4/7/134706804/2785311.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/gumegulaxi/vuzuloxas.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/ahuja_250_watt_amplifier_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5397166-5182-42b5-b8f3-1478718df394/how_do_you_reset_wireless_beats.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/aviation_industry_overview.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38d65a7e-c087-4a85-aa0c-6685dbb82fcf/what_period_is_also_known_as_the_age_of_reason.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50ad677b-0173-40d0-a3e5-08dd0b7d0b4b/bloodlines_richelle_mead_wiki.pdfIn PDF document text
    • http://pojoviraxerojo.myartsonline.com/zulisulopifexeziw.pdfIn PDF document text
    • http://zejusamipokera.myartsonline.com/bebuzobafozipopurag.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/92501172273.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_off0000e2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F9 5168 bytes
SHA-256: 72aa7e3bade5f8f34ed0b39069921b9505485962d7b60b785cf975bc372dae68
font_01_sfnt_off0000f476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF476 11852 bytes
SHA-256: f6ee1c3ac02868e85b6e78b7dd2f408b374edd36b5a5e349a30abc97fde8a01a

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