Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f927d0d0a80ec1b…

MALICIOUS

PDF

59.5 KB Created: 2020-12-03 10:29:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b4174094d180cefbd59ba2e004ae5dd3 SHA-1: 8a592eaf1cea060f178cec95c2bcc54049ed4c3a SHA-256: 9f927d0d0a80ec1b6eb6628bbae857b91284e6a25040d96a4c856b75759cfe3b
124 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically indicating a phishing or trojan threat. Heuristics identified an embedded URI and a lure consistent with fake invoices or callback phishing, suggesting an attempt to trick the user into clicking a malicious link. The document body, though heavily obfuscated, contains text related to job opportunities, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trafffe.ru/strik?utm_term=horry+electric+cooperative+jobs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427785/normal_5fb86936de490.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388612/normal_5f92046b4b32a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456393/normal_5fa0c16bb4a50.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/tedowafomaru/mamimatiwaribunid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b805fe4-aa31-4469-af90-b457c861702f/xamosovoxefawirizel.pdfIn PDF document text
    • https://s3.amazonaws.com/webipejonavuv/goxezirazekalavos.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4d7f711f6a419849ef1c8/t/5fc5f500a97599144ec66ddd/1606808832541/modesto_city_schools_human_resources.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1162b68612547ed5f39f0/t/5fc1476b3c6ccf69f38d0e35/1606502252303/analogy_test_questions.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc19ab11452f90b7fea4d21/t/5fc356edf3de5e49b5cec9e6/1606637294208/historical_method_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/gotasilemo.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_off0000ae23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE23 5268 bytes
SHA-256: af1d89ca6a257c8a55e1bbc320ae5165ff4426af9287c685da5e1a1a676067bf
font_01_sfnt_off0000c023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC023 9672 bytes
SHA-256: 8b9a0488cc0994ec93479589c79be71e47e59f545efc0fdfc975343281afa1e1

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