Malicious PDF — malware analysis report

Static analysis result for SHA-256 48370403d0ae3000…

MALICIOUS

PDF

40.5 KB Created: 2020-11-08 21:01:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 53bf16fb9208130db0084a0541c97bbf SHA-1: 1577bb42b67cac1d7d65adde7b3963f621618246 SHA-256: 48370403d0ae3000a5bc1792ee2f79a5a8bdd0a9a2dcfd282057162ebcf2ad26
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains a large number of external links, many of which are SEO-optimized and point to potentially malicious content, as indicated by the PDF_SEO_LINK_FARM heuristic. The SE_CLICKFIX heuristic suggests the document attempts to trick the user into running a command, likely to download a payload from one of the embedded URLs. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://traffset.ru/123?keyword=check+if+port+80+is+open+windows PDF link annotation
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/fijipobo_bajizisobates_xigulone.pdfIn PDF document text
    • https://wegonugu.weebly.com/uploads/1/3/4/0/134040733/5606441.pdfIn PDF document text
    • https://pevugubak.weebly.com/uploads/1/3/2/7/132740457/63117c5.pdfIn PDF document text
    • https://kidivine.weebly.com/uploads/1/3/4/5/134576756/892ae4.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/rekibedafowow/grand_theft_auto_5_mobile_apk_no_survey.pdfIn PDF document text
    • https://kidubudelojo.files.wordpress.com/2020/11/examkrackers_reasoning_skills.pdfIn PDF document text
    • https://s3.amazonaws.com/mijedusovineti/honda_africa_twin_2018_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/5th_grade_physical_science_worksheets_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/pexuvikurarejexipurunefu.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/little_johnny_jokes_about_trump.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/42079407840.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_off00005ef9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF9 5400 bytes
SHA-256: 1cc41541be335dac97b8526c70d76436a0e88c11bfaf90572e67d55d57898dd4
font_01_sfnt_off00007166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7166 10620 bytes
SHA-256: cfe591fce939356a3b78b9b51f0234f7e569412bac69eadffe073cc1bbb4e526

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