Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3a6642dc1a532c…

MALICIOUS

PDF

68.7 KB Created: 2020-11-13 15:02:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 242ed392b4ef4bfe04506faab3c385c0 SHA-1: 106eaaf32ae82003e8c87e099b288b1dd7b2b8db SHA-256: cb3a6642dc1a532c7009d6446cd8a06faca04a0239881accf72260378795a247
216 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including ClamAV and an ML classifier. The 'SE_SECRET_RECOVERY_LURE' heuristic indicates the document's content is designed to trick users into providing sensitive recovery secrets or private keys. The presence of external URIs, including one pointing to 'trafffi.ru', suggests a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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=belkin+battery+backup+unit+uses PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369626/normal_5f8b0f3186d24.pdfIn PDF document text
    • https://fuparududewon.weebly.com/uploads/1/3/1/8/131856041/jovefuxatodelixibu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5146503-4200-44f2-a789-345791711a48/naponusipimesogube.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/balloons_and_static_electricity_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dafd524d-4470-4cec-bb47-6bc9019549b5/jiwowezota.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2aaa264b-d7fd-4c69-a11b-1915d01be683/zepibiboparurediwulebowep.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/table_rock_lake_level_news.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd2067d3-cff4-4116-97fa-a1b9bc5ddbcf/download_my_stupid_boss_2_full_movie_lk21.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/rto_learning_licence_test_book_in_gujarati.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/mercado_bursatil_en_mexico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7e42a7b-93ca-417a-8a74-0592366e56ea/que_es_una_tincion_diferencial.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/crush_the_castle_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aea9c4cc-a091-4750-8c5a-da0957ed0eba/26981532261.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_off0000cfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB2 5280 bytes
SHA-256: 266ec596a4ebf1951ca9bc8913d77a56d9b6292d50b678f2c5428062ffc0c17d
font_01_sfnt_off0000e1bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BF 10572 bytes
SHA-256: 02897c9787f12c0df1ee7434ea766231dbedd19e8c92600b0668ba01d894d632

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