Malicious PDF — malware analysis report

Static analysis result for SHA-256 910b743c4d440afd…

MALICIOUS

PDF

69.3 KB Created: 2021-01-05 21:01:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 39c3c24354c9b1551d377ac98809ec93 SHA-1: 906ea080da3a21f24bc56d9aeb2db8a9762abaac SHA-256: 910b743c4d440afdf6811681cb5825e8b079d3f8e70b2bafc4487706deda7db4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://traffine.ru/aws?utm_term=context+clues+worksheets+grade+3+pdf PDF link annotation
    • https://cdn.sqhk.co/bugininaxi/jff1qih/pefisu.pdfIn PDF document text
    • https://cdn.sqhk.co/sebixodof/jigjiat/world_of_warcraft_original_game_manual.pdfIn PDF document text
    • https://gitufigekuxos.weebly.com/uploads/1/3/4/6/134634758/9677008.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/eb7dac62-271c-48f0-8b76-21dbffe9d30f/mazafalaxiwe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93d6e3d9-2faa-4484-8025-724de1d093ef/dawiwafusifus.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/3670845139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ca92332-4d7b-40b7-aeae-3595b77914cf/loluvudutidiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d8127c1-bd20-417f-9c7d-eadc3d16e862/descargar_full_metal_alchemist_2_curse_of_the_crimson_elixir_ps2_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/wanabibopobarepetavi.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/9231121590.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b87ad038-4620-4a7a-bfcb-e3cb530e70c6/28998505540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee7fac28-d9fc-4a68-af79-30e62c6d1bb2/70888272711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f8f6127-e65e-4d24-949e-46e608070ebb/94139894035.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dc03eda-c8dd-45c4-8ddf-a52910ca9098/kemikowebab.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_off0000d15a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15A 5708 bytes
SHA-256: 9ec2f48dd06ebc490cf79eb29ceb9112fe6bfc281417f2473499037aae0f2740
font_01_sfnt_off0000e4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DA 10392 bytes
SHA-256: 23a6c133f9646fbb2a13b0e2dcc8252d0256ffea44f3238f882febc5900f7153

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