Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1de0f8050138a6…

MALICIOUS

PDF

67.0 KB Created: 2020-12-04 05:09:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 8754f4debe2510c679b53e787bd79cc9 SHA-1: 26b857100367a60d7c9d6477013deb44c858cf8e SHA-256: 8a1de0f8050138a6bfe7ab861470c510a8f25211c6f81b2094d13fa08cff66af
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One prominent URL, 'https://trafffe.ru/aws?utm_term=asahi+pentax+k1000+manual+espa%25C3%25B1ol', suggests a lure related to a manual, likely to trick users into clicking. The ClamAV detection and ML classifier further indicate malicious intent, pointing towards phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://trafffe.ru/aws?utm_term=asahi+pentax+k1000+manual+espa%25C3%25B1ol PDF link annotation
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/pagabasijepulesetiga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449181/normal_5fa11bc729ce1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449614/normal_5fb856fa2494e.pdfIn PDF document text
    • https://tudaluvakagovax.weebly.com/uploads/1/3/4/6/134614365/ritisebi.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
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc144a93398ff7515307f21/t/5fc62611fa04221c71f1d8ab/1606821396525/smiling_face_with_sunglasses_emoji_symbol.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe0b49f3de5e49b52b6b82/1606290250730/farmington_special_preschool.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc016b9c30a162e0c4e17a3/t/5fc2f11464571256549d9e3a/1606611220554/38561803383.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc50d53c6229360ecc78f6a/t/5fc5aba23c6ccf69f322d74c/1606790052779/the_republican_playbook.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0cf3a5e8e827d428d5c84/t/5fc206249ee0f32b8799d944/1606551077697/olfina_gray_mane.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc35ec0405d5340f3397707/t/5fc739275fecd2174b5b320e/1606891819513/widuxefesoruvedovukip.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_off0000a866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA866 5372 bytes
SHA-256: de4e6569cd518fd10adf2170a2a2761bed14ac0d437e8ac7e113c1064c5e820f
font_01_sfnt_off0000ba34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA34 6392 bytes
SHA-256: 58317d2b042ffe881a3174345e8b682f27d93939cfccc3138fbea0d78c3ffacf
font_02_sfnt_off0000cb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB22 10940 bytes
SHA-256: af2b9b53324d4af8e000c384f48a19ce9ca99aad43ee020b497d916afec6050b
font_03_sfnt_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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