Malicious PDF — malware analysis report

Static analysis result for SHA-256 42aba7e8eb8cfdc8…

MALICIOUS

PDF

82.1 KB Created: 2020-12-24 01:55:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 74d05541e9e8d466c52c7ec7914dfe31 SHA-1: 8eb5de33055e35c8bcc08cd2bc4a5bdf5f611964 SHA-256: 42aba7e8eb8cfdc85c8de376796c6fab109b05d7f6d5fcc7f250751e50cc8350
222 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of a download button lure further supports this, suggesting the document is designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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
  • 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/strik?utm_term=planetary+gear+reducer In PDF document text
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/mitesem.pdfIn PDF document text
    • https://wojopegoguw.weebly.com/uploads/1/3/4/6/134690206/ca14f29cc.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/2ba56094-56a5-452d-a3e2-c7d6244dd73f/kiveronudexubuniwaxoveneg.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/rofotudal.pdfIn PDF document text
    • https://s3.amazonaws.com/juvetaso/6169610337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed52dd9b-fc25-45f8-bfc2-dab5efb0c5b7/jirenalekitomebil.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/75820640594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8ab303f-f02a-4913-9fc2-4088838a3f17/java_software_solutions_9th_edition_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/16056085937.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/xemozirirerojewasosipom.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/basketball_stat_sheet_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5361beb-4a4a-4436-bd38-b756ed5d7530/xenazikozotuf.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/gutupegorodukekamo.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_off0000edd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD3 5032 bytes
SHA-256: d36a7c6f12ca784b6f39d8a51082ff9ac40f5cbd1943b6d997d62f7fd4c6ca7f
font_01_sfnt_off0000ff05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF05 11656 bytes
SHA-256: 4010faa13371982b52e34087910df8ce0cc71738df578defe55d8529b8b9244b
font_02_sfnt_off00012667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12667 16060 bytes
SHA-256: 84d5bd19c210eb3b73ecc14096ab1e56fdfb5b80ce7ba4f0052c67c0c2b02727

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