Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f66a706ec18b736…

MALICIOUS

PDF

129.2 KB Created: 2020-12-16 21:41:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 82e97b607dc255507a3c688acd5b7f23 SHA-1: c0bf0fe8ddc7fc54575dccefc1c7a71d140786dc SHA-256: 4f66a706ec18b7362ba13b9141e3168339880b079db23ee47634949c8556e1cc
164 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for an external URI pointing to 'trafffi.ru', which is suspicious given the context of a 'free steam key' lure in the document body. The presence of a large number of external links, many pointing to S3 buckets, suggests a link farm or SEO poisoning attempt. ClamAV also detected this as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=universe+sandbox+%252A+free+steam+key PDF link annotation
    • https://togelugifipa.weebly.com/uploads/1/3/4/6/134648123/dokezese.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/quien_soy_yo_la_biblia.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/davowugu.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/annual_report_file.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/the_stormlight_archive_book_1.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1cbe78ef7301f8b171054/t/5fd193a8ac13f65f660e6074/1607570345669/neha_kakkar_songs_new_downloadming.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/polyisocyanurate_pipe_insulation_data_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/31451336581.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/lemanaxafofasizoxobeg.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/baldur_s_gate_dark_alliance_2_xbox.pdfIn PDF document text
    • https://s3.amazonaws.com/votubukaxogilix/4668613858.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fce6f9241244c1973d264cb/t/5fd6fd61102ca46975f9810a/1607925089564/89372915164.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/ranofavewisolatoladig.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e727ea4a794d5645064f/t/5fccd9f46f0099009e62b034/1607260661607/33297827537.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://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DA7 5764 bytes
SHA-256: 672618ca577ac0ed045f957509baad393dbc656a5254ad3358cdf95fadb4bd74
font_01_sfnt_off00019164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19164 5516 bytes
SHA-256: 20788d9e54b9f7ef74258aa72bd92ac2ab834586b1bcc7a97b412b1108305b8c
font_02_sfnt_off0001a425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A425 11184 bytes
SHA-256: cd5cb5a836ce6ef7b7d40dc7cf23d77f7a267eb5d4deef2b4484a24e0cb59b22
font_03_sfnt_off0001c396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C396 19740 bytes
SHA-256: 780e81f9fb61f95653f09da183cdc98e48067ae65d0238201954e518fa7b1441

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