Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fcca1138c6813f9…

MALICIOUS

PDF

75.6 KB Created: 2021-06-09 02:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55591f377908ab3bfadc8f6c5eda5a62 SHA-1: 7a536c984a97a5a58b5a641cc28affda5ad080e9 SHA-256: 6fcca1138c6813f9d30820ccec069d78d873bd678aedf94dc2dfb1ea9611eb3a
164 Risk Score

Malware Insights

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

The PDF file contains multiple external links, with one specifically pointing to a URL suggestive of a free download, and another indicating a link farm. ClamAV detection and ML classification strongly indicate maliciousness, classifying it as a phishing trojan. The presence of embedded URLs and the heuristic for a "download button lure" suggest the document's primary purpose is to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/pbw?utm_term=cuphead+free+download+mac
    • https://vukibawurop.weebly.com/uploads/1/3/4/6/134601902/2211653.pdf
    • https://cdn-cms.f-static.net/uploads/4482406/normal_60314590e68fe.pdf
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/2203939.pdf
    • https://korebamo.weebly.com/uploads/1/3/0/7/130739662/dcf69575.pdf
    • https://rawogozanukej.weebly.com/uploads/1/3/4/6/134623914/likogutav.pdf
    • https://lijipowurop.weebly.com/uploads/1/3/4/3/134314174/rusasapore.pdf
    • https://cdn-cms.f-static.net/uploads/4413867/normal_5fe7e6c72a863.pdf
    • https://lisofagan.weebly.com/uploads/1/3/4/5/134598873/b6ed57d7.pdf
    • https://rolejiminuvaw.weebly.com/uploads/1/3/2/7/132740194/jebewej-zaxolutod.pdf
    • https://tomasuniraruz.weebly.com/uploads/1/3/5/3/135392941/tituletukil.pdf
    • https://luxelekite.weebly.com/uploads/1/3/4/6/134656707/4399703.pdf
    • https://static.s123-cdn-static.com/uploads/4483359/normal_5ffc601e818b3.pdf
    • https://nijupafubowawiz.weebly.com/uploads/1/3/4/0/134012726/f409758.pdf
    • https://xajomorunineg.weebly.com/uploads/1/3/1/3/131383441/dotuvozo-xifoda-zupolizit-fexarogadake.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/225e6cd6-6641-4b37-9c9e-b597c6973e80/how_to_use_scientific_notation_on_a_casio_calculator.pdf
    • https://uploads.strikinglycdn.com/files/6a231911-e102-4a0b-8fd1-3b2d813688a3/is_2021_a_good_year_for_gemini.pdf
    • https://uploads.strikinglycdn.com/files/b4abfbe4-0db0-41f4-a77e-feab39b702b9/projective_geometry_in_art.pdf
    • https://uploads.strikinglycdn.com/files/b5cea2fc-694b-4971-b40c-8df673831215/calendario_escolar_2019_sep_2020.pdf
    • https://uploads.strikinglycdn.com/files/5cd6d64b-2652-48ab-b1d3-7e31d1648e88/high_definition_audio_bus_driver_windows_10_64_bit_amd.pdf
    • https://uploads.strikinglycdn.com/files/1d07006a-abae-411a-8dbe-2a0372b0ef12/pawolijibop.pdf
    • https://uploads.strikinglycdn.com/files/944b1c65-9ac3-48f0-9153-178f37bb4b88/26936155273.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db5a.bin
05c61b2a3f3d6100942f56c311e8baf9747114330bbc58493b8f75c7531eafe1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5A 5084 bytes
font_01_sfnt_off0000ec8c.bin
88c69050a48b0647c13f23aec5d5266dddbf99a2b48cd563aad284333cb0d70f
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8C 10820 bytes
font_02_sfnt_off0001118a.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1118A 4324 bytes