Malicious PDF — malware analysis report

Static analysis result for SHA-256 6808646ae5254cf9…

MALICIOUS

PDF

74.6 KB Created: 2021-01-16 18:49:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 653e4832b9327f39f15b8e21f8166b16 SHA-1: ff1fe6e4661f92c7f6d0b4c538379b874820f8b2 SHA-256: 6808646ae5254cf9c502c7a7d1896bc3a84479a02b40538329809813126bf35d
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with critical heuristics indicating redirection to known malicious infrastructure and participation in a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://traffine.ru/123?utm_term=cen+tech+manual In PDF document text
    • https://lujipened.weebly.com/uploads/1/3/2/7/132740552/4545311.pdfIn PDF document text
    • https://jamakebowixon.weebly.com/uploads/1/3/4/4/134477175/376d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462350/normal_5fac5c2db24c2.pdfIn PDF document text
    • https://gamunodeda.weebly.com/uploads/1/3/4/7/134765824/rexosub.pdfIn PDF document text
    • https://netaluzubik.weebly.com/uploads/1/3/0/8/130813777/zekejiwonox_jozowumef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447662/normal_60027584263a0.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/dazemi/google_docs_spreadsheet_calendar_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/stack_the_states_2_map_it.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/vector_ornaments_illustrator.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/bapikenewowajusumasu.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/vamikamu.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/guidepoint_security_revenue.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/astronomical_survey_in_civil_engineering.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/88516033799.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C1 4512 bytes
SHA-256: b9ecd943c4dd6a19367c042f10a798ef14af9438d61ccaa42be385f82ae6fc2e
font_01_sfnt_off0000d1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E2 11852 bytes
SHA-256: c73479712087502cfc076b4055e3e326b498d626f8e1b9cfb4bb0493efa280f5
font_02_sfnt_off0000f95f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95F 16076 bytes
SHA-256: bfd5fcdb7495bed175e4f51938194e2ecb7e505d90535bc2124716332a04a4ab
font_03_sfnt_off00010e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E08 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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