Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c1b038fcc7357ca…

MALICIOUS

PDF

71.6 KB Created: 2021-01-13 19:10:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 0a698eb7890e84a45ab9c95f9a521343 SHA-1: cc037a868759931cae44e8af88a6040d9da9e4c0 SHA-256: 3c1b038fcc7357caa778950919fdbe8d186a98054b7ed009f4dcb53e7d5c9a1a
222 Risk Score

Malware Insights

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

The PDF contains multiple links to external resources, including a known malicious redirector. The presence of a 'download button' heuristic and ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links indicate an intent to redirect the user to malicious content.

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://gettraff.ru/aws?utm_term=employee+form+sample+malaysia In PDF document text
    • https://cdn-cms.f-static.net/uploads/4471992/normal_5fb843b54c59b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5fc1347cc005e.pdfIn PDF document text
    • https://bijesuvudapij.weebly.com/uploads/1/3/1/8/131860553/2718862.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477910/normal_5fdc545a05736.pdfIn PDF document text
    • https://cdn.sqhk.co/kamupudoro/cAifihS/download_game_dumb_ways_to_draw_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389809/normal_5f9b1a5f4dd1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376600/normal_5f9396cdd0114.pdfIn PDF document text
    • https://xepuzuzolewu.weebly.com/uploads/1/3/4/3/134324818/c3f52f.pdfIn PDF document text
    • https://site-1177991.mozfiles.com/files/1177991/faces_of_illusion_the_twin_phantoms_bracelet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428341/normal_5f9d4b665a1db.pdfIn PDF document text
    • https://site-1198426.mozfiles.com/files/1198426/roxodesetodimijune.pdfIn PDF document text
    • https://lutomired.weebly.com/uploads/1/3/5/3/135316507/32488f662849.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375352/normal_5f919f2fc828b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000daff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFF 5108 bytes
SHA-256: 2e8c121399c00524f9f02246ec1d7016b6e1ed3354acdec65a6c1864ed65c6a7
font_01_sfnt_off0000ec53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC53 11056 bytes
SHA-256: 94591e69a8fc242e145f6c0ec76e0c9bb454239e51f80c7fa8b6a15fdc5d92f5

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