Malicious PDF — malware analysis report

Static analysis result for SHA-256 16b74624d054fef6…

MALICIOUS

PDF

76.8 KB Created: 2021-02-16 08:55:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 8c51979d02642d408094d4334bfc468e SHA-1: afd41462f8f6545bb664418626966324683ec533 SHA-256: 16b74624d054fef6b06e3d5b0486d7c11b3047bb7e80370cee2a18b6e0b2fab8
234 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external websites, suggesting a link farm or phishing attempt. One critical heuristic identified a link to a known malicious redirector, and another flagged the PDF as a potential phishing trojan. The document body, though heavily obfuscated, contains keywords related to product pricing, which could be used as a lure. The presence of numerous PDF links and a link to a malicious redirector indicates an attempt to drive traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://crophysi.ru/wb?keyword=netgear%20gs308e%20price In PDF document text
    • https://sozazoje.weebly.com/uploads/1/3/1/1/131164180/lonovixelelaz_kirobifiwebubo.pdfIn PDF document text
    • https://vezefujofebiv.weebly.com/uploads/1/3/5/3/135304234/2048521.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382643/normal_5fcae865547d7.pdfIn PDF document text
    • http://wuteziben.iblogger.org/juwezefujepob.pdfIn PDF document text
    • https://ziduwoparexor.weebly.com/uploads/1/3/2/8/132815175/jurirokuxu_lavawuwazedaze_mapukik_peros.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407789/normal_6008f1a66ee6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403684/normal_600e3a5dd189f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/bulalowisu/zukuborosi.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/70486449712.pdfIn PDF document text
    • http://tinanatibora.rf.gd/35219589931.pdfIn PDF document text
    • https://s3.amazonaws.com/mefovu/aldabra_giant_tortoise_care_sheet.pdfIn PDF document text
    • http://rozizibuno.epizy.com/29166303138.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/lajojanedatifowuwapezef.pdfIn PDF document text
    • http://sizatopus.rf.gd/microsoft_powerpoint_venn_diagram_template.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AC 7520 bytes
SHA-256: 67658655c22f18c3a5a9f19267c5df5c80742db840ae222594dfc8c4027b51db
font_01_sfnt_off0000e068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE068 5108 bytes
SHA-256: 04a9093ddd15f7a126d6c90d11d1ac10c8933447153106ed3c22d7a6d5a453a6
font_02_sfnt_off0000f1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D3 11112 bytes
SHA-256: 056a74cf17987079036c5fcf321a949c3e5b38a277b8b17ce9fb4ab09419cc0a
font_03_sfnt_off000117b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B3 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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