Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d9592a8548d5406…

MALICIOUS

PDF

70.8 KB Created: 2020-12-22 00:37:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 4a3a9082a43c8639b78891a55beb0d92 SHA-1: cc911789b5377e7e48b164d6d57937bc91eafc06 SHA-256: 6d9592a8548d54065529efd25fd4ac11d6c3922b2fbd88821152952e0f86aefd
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, contains keywords related to resume formats, suggesting a lure to entice users to click on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/aws?utm_term=supply+chain+management+resume+format In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379486/normal_5fa59d27f1472.pdfIn PDF document text
    • https://tidukefawa.weebly.com/uploads/1/3/4/8/134851120/xemeruzorip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481154/normal_5faf880cc7331.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/fca49957-4a27-4208-bd10-8a0f7a4e52c9/bikibijabotivujuguparamuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43280781-b55b-4f45-80b7-23f3f0b482e7/dudakiberitaxifo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3532da6b-12b1-480f-aed0-23a2cef6e519/gevivaril.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc33d29405d5340f338d172/t/5fcc27910ab5d62febe2be85/1607214993903/demapilubomigajex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f03b6d7c-07c7-4a19-8d51-941bd8908c47/discerning_merchant_s_price_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fe869e7-521b-4af8-830d-c5e036e18cd6/77020743431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdea5932-90d7-40cd-8471-e9dfec1c5181/xiwivalupuvukuko.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2b80e5bcb0228a28e2589/t/5fc6b6a61d106d256ba93870/1606858406377/4561657567.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f175d552-bc2d-4f97-ba6d-ecbeb3d1b5f9/facebook_app_for_android_free_download_apk.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5066e104edf1d779b9afc/t/5fcb6d618dcc5603bef3bd10/1607167330503/wolefebalepovazizod.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_off0000d7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B9 5632 bytes
SHA-256: 2aa832ea36a28b054929a90b7eb2d9c3149782e6fdb8f5ad9aaf13ab98b6a6a4
font_01_sfnt_off0000eac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 10516 bytes
SHA-256: 36e03d41b4ca68e0fe9602ae984799ba81ec139596ce3c82bb50be35e44dc642

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