Malicious PDF — malware analysis report

Static analysis result for SHA-256 91efbfd2c34ffde6…

MALICIOUS

PDF

69.1 KB Created: 2020-12-07 08:52:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d1c79b097855cf0720afec6609889e2e SHA-1: b3c06e7b65b82b1f0e97c883352f4ae42552ad7d SHA-256: 91efbfd2c34ffde6f4dba89b057f1d442c8f0e3e2675339550d09be3f2eb5dcc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to seemingly unrelated PDF documents, suggesting a link farm or SEO poisoning tactic. The primary malicious URL identified is trafffe.ru, which is likely used to host or redirect to a malicious payload. No scripts were extracted, but the presence of numerous external links and the ML/ClamAV detections strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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=ctet+syllabus+2019+in+marathi+pdf PDF link annotation
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/6946690.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457014/normal_5fc4cbcf2c5c1.pdfIn PDF document text
    • https://xemifedawunata.weebly.com/uploads/1/3/0/7/130775780/kezovewuv_jeguvame_piwirivuveko_zefoku.pdfIn PDF document text
    • https://winomumamo.weebly.com/uploads/1/3/1/0/131070375/gekatefobawo.pdfIn PDF document text
    • https://pejopazuzaguwoz.weebly.com/uploads/1/3/2/8/132815183/8225521.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476930/normal_5fbed90c43488.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/ascitic_tapping_procedure.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c130f99-8841-4a89-bdf9-ff89f354a289/pusofobulowugob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fd44689-dc02-4923-aff4-5ae1355a44d7/82041451538.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/scert_kerala_textbooks_for_class_5.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/javascript_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/obsession_phrases_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/cover_letter_heading_template.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_off0000ce69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE69 5912 bytes
SHA-256: 69d0e018b386a5827b743248e5c005ba963387a150f13c6c27c46f07456a0f0f
font_01_sfnt_off0000e257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE257 10808 bytes
SHA-256: b1b4308930116551c55b200cdb69f9869f9243dcf6f3f1f9509c741301662a55

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