Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc76fd83aa77a5d7…

MALICIOUS

PDF

85.6 KB Created: 2021-01-18 20:59:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 699dba19387d48dd4d2a06601e6b9144 SHA-1: efac7c475e3ceb6fb08476d284eef9435a476a0b SHA-256: fc76fd83aa77a5d761b63624d11b707dc732ccd66aca263c87bf83af0faf4e82
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to other PDF files, suggesting a link farm or a method to distribute further malicious content. The presence of a download button lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially harmful sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://trafffi.ru/123?utm_term=xbox+360+aimbot+downloads PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4458144/normal_5febe879dd189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485161/normal_5fb00e96d4360.pdfIn PDF document text
    • https://site-1177498.mozfiles.com/files/1177498/41265239116.pdfIn PDF document text
    • https://site-1175531.mozfiles.com/files/1175531/mefulujitodazutozegemef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393511/normal_5fec0b29421a6.pdfIn PDF document text
    • https://tizezesi.weebly.com/uploads/1/3/4/0/134041120/28012.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/jiruvizut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379387/normal_5feb29a149b51.pdfIn PDF document text
    • https://site-1175041.mozfiles.com/files/1175041/reading_test_2_ambergris_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369506/normal_5f9cdd19664e6.pdfIn PDF document text
    • https://site-1167953.mozfiles.com/files/1167953/62680700149.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/lokijuronig/5162810440.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/paranoid_schizophrenia_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/xitazimetuwagufiserugu.pdfIn PDF document text
    • https://s3.amazonaws.com/zepifudoxapo/74269229998.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/heigh_ho_nobody_home_sheet_music.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CB 5612 bytes
SHA-256: eb98b4fb4f348b7f8bd94339ffd8b6bb6c675fe028c18813f031d530349aab00
font_01_sfnt_off000118d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D8 2112 bytes
SHA-256: a788e9dfd5c6023b8177174a49cbe6b3c238c2e4eb7513ad5bab1c6a8f16d514
font_02_sfnt_off000122a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A9 11248 bytes
SHA-256: 595c465a72398961f5dbd221aa0c54d1ad3c2025fa28206d06e180b64b4af62a

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