Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ce551336dcd771…

MALICIOUS

PDF

71.0 KB Created: 2021-01-08 00:32:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 2875735fb4ef3b188e16d27f5f367da2 SHA-1: ead121d9ffbe6acef69373a7a2f3aff69dccecc7 SHA-256: 37ce551336dcd771451c7f375bf233753fd93c7a8a44a269fc93e5cc8339acf7
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified by both heuristics and a machine learning classifier as malicious. The ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan. The document body, though heavily obfuscated, appears to be a lure related to a school lunch calendar, suggesting a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://trafffi.ru/123?utm_term=west+hartford+school+lunch+calendar PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4414173/normal_5ff78a1818c72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374372/normal_5f8d5840aa555.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367013/normal_5f93c5c273e2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391634/normal_5fb2defdf1827.pdfIn PDF document text
    • https://tuvitewolejuxow.weebly.com/uploads/1/3/4/6/134615754/navebutasala_weduforuvokuput.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/xijuxosisomuna/graveyard_keeper_achievements_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/432a6d0c-3ceb-446f-bd12-e1a1aab92615/dewalt_4200_psi_pressure_washer_dxpw4240.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/jujewejewilaxekek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a038221-ad81-4545-8bdc-a85681c0df43/rijabemedirebis.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/cinebench_release_20.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7f92f3c-be52-4261-878a-7b436caf831b/31623633921.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB882 5124 bytes
SHA-256: 319d21891e4d70ded9f5767446972f7879807010f5e52387d19c4362b4a00e3a
font_01_sfnt_off0000c9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9ED 12560 bytes
SHA-256: 2004b5c45acfe84f405e36f870d568ecb9fe18bb11356990a5fa81c540500f16
font_02_sfnt_off0000ece7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE7 10008 bytes
SHA-256: 0cf24ec51b014b76bc793badaeaf9f530da233919c1b1fef9001202e40d56da5

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