Malicious PDF — malware analysis report

Static analysis result for SHA-256 5517a3765829d1b5…

MALICIOUS

PDF

73.9 KB Created: 2020-12-03 17:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: e16cdf4196655fa214ee63b737680ef2 SHA-1: bb51b3148289d2c5a936186249e1e50e175a201e SHA-256: 5517a3765829d1b544ffccb612acfb1bb1728695c7b8b424332cd35a65ec43a0
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document that contains an embedded URL. Static analysis heuristics and a machine learning classifier flagged the PDF as malicious, with ClamAV specifically identifying it as Pdf.Phishing.Trojan. The embedded URL likely leads to a phishing or malware distribution site, and the document's content, though heavily obfuscated, suggests a lure related to a 'certificate of appreciation template'. No scripts were extracted, but the presence of an external URI and the overall detection profile strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafficel.ru/aws?utm_term=certificate+of+appreciation+template+in+word+format PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366304/normal_5f8730ca8f974.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407784/normal_5f9604be3b684.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417032/normal_5fbf3379b43ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f8cfa9585063.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe5fe2e18c5c478ecb318a/1606311910604/angel_of_death_womens_costume.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5909340f1034a5cc888ef/t/5fc60b8c4e98326c02e0ad5b/1606814604434/geometry_final_exam_study_guide.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc71659778af068263c8d3c/t/5fc85c6cd32d012678f78903/1606966381970/bazazolusebenu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0d8d024b06a7eb3fedc56/t/5fc2f7a4173fb5383b058bc9/1606612900754/85318519372.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a6bcbcb-27d3-4648-bd80-89765a41e660/nemubowagorep.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/letter_of_recommendation_examples_from_friend.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc115bd5e8e827d428ee316/t/5fc21d45fa04221c716792c4/1606556997695/wilderness_systems_pungo_120_kayak_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/convert_to_word_nitro_reader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ed86198-973f-44d4-98b3-128206a75a03/60857810246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d29558f3-599d-46fa-86fa-8a16b46ac150/85177525361.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AB 5120 bytes
SHA-256: f5e7acb2e130a1039d6cf772570d87104bdbe9ed5fdd519d9f7263eea1f5e516
font_01_sfnt_off0000f713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF713 10488 bytes
SHA-256: 3a985972e42671b8892f9f914502f010c2c95d6bc836f98c3e43d545ab98bfda

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