Malicious PDF — malware analysis report

Static analysis result for SHA-256 26386f430bc37338…

MALICIOUS

PDF

73.4 KB Created: 2020-12-18 15:55:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb47023ef319b714722cd4aba3bc1810 SHA-1: 1992ef89be443b8d04facef57393798dcb988093 SHA-256: 26386f430bc373388b02136ac5158b5a419ac361ad0bec01ac8907eb714c9c83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains an embedded URI pointing to 'trafftec.ru', which is likely part of a phishing or malicious link farm strategy. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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://trafftec.ru/strik?utm_term=coffee+break+arcade+mini+golf
    • https://xikematevi.weebly.com/uploads/1/3/4/3/134392378/masafudirabobe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/8d9e91e3-dac9-4b47-9501-9d47b38b4bda/pembroke_public_schools_school_committee.pdf
    • https://uploads.strikinglycdn.com/files/e0095544-8b73-4fdb-a61b-36e6dd598c28/regaxoj.pdf
    • https://uploads.strikinglycdn.com/files/759ac75d-d766-4677-901e-95b2292327bd/38422703171.pdf
    • https://uploads.strikinglycdn.com/files/1217dedd-cd2d-459c-a9d3-859c740ec174/lokatukisideputub.pdf
    • https://s3.amazonaws.com/pexodugosa/macedonia_missionary_baptist_church_ga.pdf
    • https://uploads.strikinglycdn.com/files/0d94a103-4c81-470f-b89e-b7b9786ab0cc/oci_document_checklist_nz.pdf
    • https://static1.squarespace.com/static/5fc5677ef9866f3fd2f21712/t/5fc67e2f4f98375720bfcc74/1606843952354/is_tubi_app_really_free.pdf
    • https://uploads.strikinglycdn.com/files/20cb9cc6-ac2e-41b0-9df3-955f13d47d51/xewodopafatinepixifil.pdf
    • https://uploads.strikinglycdn.com/files/d532b829-d0cb-4fb2-9bec-03bdc14dfb0e/71638840223.pdf
    • https://uploads.strikinglycdn.com/files/9f3eddf4-db1f-4464-881f-b2e7ced7f393/20614181250.pdf
    • https://uploads.strikinglycdn.com/files/c1fa0d2b-f536-4288-824a-87071ae14d43/ruvunerefab.pdf
    • https://uploads.strikinglycdn.com/files/5701fe01-8f17-441c-a80e-4d786ee7bf7f/zegabowumiviwab.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_off0000d2fe.bin
fd2d2c6dc67bb32ed0423feb1b88d10e8ea88eadb88b48e07f4dd335b011b0d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FE 5096 bytes
font_01_sfnt_off0000e437.bin
feaf60b796d788fd3b14bcb0753b13c43fae4ad4ac2b0ed35bbd5b15e8de5075		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE437 11428 bytes
font_02_sfnt_off00010921.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 4324 bytes

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