Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fdb5e0fe4b16eac…

MALICIOUS

PDF

94.0 KB Created: 2021-05-17 23:42:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 0e2e9feef455b2ca8cb9c7460e13eb0d SHA-1: 865123b8b618cbabc9d775401278843b4ae41274 SHA-256: 7fdb5e0fe4b16eac162e3910d7f6358f8d326c704f051fef5c03745ebcea50ed
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly domains, suggesting a link farm or redirection mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, likely a phishing lure or a downloader for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://posepopofag.weebly.com/uploads/1/3/4/6/134609660/wirurorugimax.pdf In PDF document text
    • https://gavibokilixebil.weebly.com/uploads/1/3/4/7/134716725/2cfcb0effcf021b.pdfIn PDF document text
    • https://zewadozodatigi.weebly.com/uploads/1/3/4/3/134337643/3727472.pdfIn PDF document text
    • https://gopikuximodel.weebly.com/uploads/1/3/1/3/131384340/kevivudod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497638/normal_605b74ec91ab4.pdfIn PDF document text
    • http://rujakagixawimir.22web.org/agricultural_science_grade_12_2020.pdfIn PDF document text
    • https://guwazexapa.weebly.com/uploads/1/3/4/7/134706575/ef0e3f400.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426423/normal_5ffba9758152a.pdfIn PDF document text
    • https://luzenage.weebly.com/uploads/1/3/4/3/134317967/2200fb0405f5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454672/normal_5fc90b7354772.pdfIn PDF document text
    • http://dilorefab.22web.org/empty_music_score_sheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/kMuynZNWtA0/wb?keyword=wd%20my%20cloud%20not%20showing%20up%20on%20network%20macPDF link annotation
    • https://s3.amazonaws.com/fikuvine/hillsborough_county_schools_closed_for_hurricane_dorian.pdfIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/57514211400.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/best_books_to_read_for_stock_market_in_india.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/24336088255.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/fokakadazilubapi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a21d4c-36f3-46e6-83f1-8415b3877d27/how_to_write_a_case_report_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46995b55-a88c-4192-b0e3-faf809d7ccf6/27144154637.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F2 5640 bytes
SHA-256: db3b572e7ba2767e9d84b7e0ba2747ec49f1399ff9102a99fdba959271eef4bf
font_01_sfnt_off0001370b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1370B 11040 bytes
SHA-256: 97f901e57581aa79e7c8af3490e0843c1af6e294cf6234675071f398af33cbce
font_02_sfnt_off00015cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CAD 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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