Malicious PDF — malware analysis report

Static analysis result for SHA-256 e65ad0ab6fe46544…

MALICIOUS

PDF

75.2 KB Created: 2020-12-22 20:15:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 256d521695a1ea7818f293d230abcabd SHA-1: d43102f51be11baad724ed27062427d09c63cca3 SHA-256: e65ad0ab6fe46544e904342b2f3f3da5d47365ab765bc4b0f5e3b02ba2b94578
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'traffmen.ru'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external PDF links, many of which are hosted on S3 or Weebly. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the embedded links are the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffmen.ru/123?utm_term=camping+mod+1.12.2 In PDF document text
    • https://zabamaki.weebly.com/uploads/1/3/4/8/134849969/9733827.pdfIn PDF document text
    • https://xifobosakup.weebly.com/uploads/1/3/2/8/132815359/wajes.pdfIn PDF document text
    • https://noxerurivago.weebly.com/uploads/1/3/4/7/134767941/7262330.pdfIn PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/1753008.pdfIn PDF document text
    • https://sudororurupe.weebly.com/uploads/1/3/4/6/134602833/3118595.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/fedure/calculo_resciso_acordo_reforma_trabalhista.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/64536402665.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73d04ea7-3451-43b5-a8ac-af9c6562f39e/34083001590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c95267-ba46-4fb3-832a-9430060e7fa3/gabizo.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/metformin_hcl_850_mg_weight_loss.pdfIn PDF document text
    • https://s3.amazonaws.com/fedure/25660908579.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/87415878593.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/35951643641.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d158018c-1515-414a-9cce-13b4efaaaac3/78355163129.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/amazon_go_case_study.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_off0000c4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B8 4804 bytes
SHA-256: f4be8cb2915a13bfe49ef888a2a20430350de8ce1d9e742b099ff786d2b5cbb5
font_01_sfnt_off0000d4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F5 11564 bytes
SHA-256: 15bcb9ebfd35760fa46542e00dcf0d431534db59ecd243e5104ad3134222d22f
font_02_sfnt_off0000fb36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB36 16064 bytes
SHA-256: 9b78b915eb75ef0aea6965a6113565ca1bcac7735c766488ce9f12ff332a71b4
font_03_sfnt_off00010fca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCA 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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