Malicious PDF — malware analysis report

Static analysis result for SHA-256 84bf6e9c47448bb0…

MALICIOUS

PDF

90.5 KB Created: 2020-12-18 01:20:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 14d7be392f4ba4617ba34dac1a931dc0 SHA-1: 2578410a5b6b6adbf4c3b46dfa74025f73f56007 SHA-256: 84bf6e9c47448bb020b17d64522a284c54fd3850a87649ccbba6ac90e15e86ef
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains heuristics indicating it's part of a link farm and uses a password-protected archive lure, suggesting it's designed to trick users into downloading further malicious content. The embedded URLs point to suspicious domains, likely serving as part of the distribution chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffnew.ru/aws?utm_term=edirol+hq+orchestral+free PDF link annotation
    • https://tujurexi.weebly.com/uploads/1/3/4/7/134743655/vemokazovi.pdfIn PDF document text
    • https://pepusaneped.weebly.com/uploads/1/3/4/5/134503703/12d9c792d743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381081/normal_5f946a2b7c24c.pdfIn PDF document text
    • https://rizenuwav.weebly.com/uploads/1/3/4/3/134335920/3698683.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/b646f330-38b7-427c-87c4-4271247b7dd9/mavivu.pdfIn PDF document text
    • https://s3.amazonaws.com/wuxupewu/credit_report_dispute_form_experian.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/99102395685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b048e57d-766c-4ea8-955b-65268f4dd408/49370291745.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/formal_dresses_at_galleria_dallas.pdfIn PDF document text
    • https://s3.amazonaws.com/gebaxovudofe/the_way_of_kings_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/mijumomub/kowigewoxozomugofirena.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A1 5192 bytes
SHA-256: 4053627baf24723febf9adfa3654e5163c142dd80320cd50ad10375b11caf176
font_01_sfnt_off00011545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11545 11420 bytes
SHA-256: dc692b67b0e2b301dc4841effa11b863923b34afbd8e70cf8aca29528de8d2e2
font_02_sfnt_off00013c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C5E 18992 bytes
SHA-256: ad45b056d0d0abc0821e3424c4c0742db38be7029873400c73d64a20ca8b0d0b

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