Malicious PDF — malware analysis report

Static analysis result for SHA-256 1824d41bf68bf273…

MALICIOUS

PDF

76.0 KB Created: 2021-03-26 07:03:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d12ec5e7dc69c5f5fe6a1717c63ac6fb SHA-1: 12efa1b723d10bb9103ef4ae3aed9c7479f9b6c1 SHA-256: 1824d41bf68bf27335417a8002a67a1cac62feab6f8abbfa7736893659d2a185
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 0.9991

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://gimoguvi.ru/strik?utm_term=what+are+the+easy+songs+to+play+on+piano PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447903/normal_600f49b41d087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454180/normal_6020795b181c6.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/gapivegek/conservation_biology_journal_submission_guidelines.pdfIn PDF document text
    • https://3f7ff619-1e23-491c-a925-ddda4d79b49c.filesusr.com/ugd/79c22a_40c2ce1baf064b20834f0d7f93f18887.pdf?index=trueIn PDF document text
    • https://f6e2a16f-d004-42cd-8f17-0463e090774c.filesusr.com/ugd/c70c35_28499210d89b435fa99400ee2be63f4f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nowokil/35129146674.pdfIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/l_feel_love_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/796d179e-75e3-4308-83da-98e609cbabe9/pawixuninupoxotupewaf.pdfIn PDF document text
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_95d4b2f2eea947a1b695aa8d8687a222.pdf?index=trueIn PDF document text
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_c220aa232155448780c578182127641a.pdf?index=trueIn PDF document text
    • https://c3373aeb-ed74-4f2d-b631-fa679e0a3f6f.filesusr.com/ugd/cbe7f7_cfeaca1ac86a45d4bdfb652181b35f69.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remavuj/current_liabilities_balance_sheet_classification.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/zafevidefafumepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf0e6d14-70ba-4b31-b4ea-9646b248193a/7483294623.pdfIn PDF document text
    • https://976edc35-935c-46de-9e6e-e225dbc25668.filesusr.com/ugd/0829d8_76a9ed7e9c3449179f17922e3ebab333.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf261459-2b95-4008-b83c-cf69eb00b1fb/zudofimopa.pdfIn PDF document text
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_67d1f08c642146308ad270d20f68f599.pdf?index=trueIn PDF document text
    • https://1f571a09-6495-4108-bd1a-9715deae29b5.filesusr.com/ugd/b0bf26_d19591ae3aaf4375b481eb6d7e6bb284.pdf?index=trueIn PDF document text
    • https://ba9dc33f-61c2-415e-8598-c57272458a21.filesusr.com/ugd/c05727_695c17b05dd04ba696f2a031724e731d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bidivo/12601575483.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/fate_extella_link_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mudurixo/ultima_weapon_ffxiv_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3804e58f-600d-4b94-844a-30e66420f229/girl_interrupted_movie_poster.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1d509be-7bbb-4761-8cb0-20dcee5d4564/kavowuxu.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_off0000eb0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB0D 5196 bytes
SHA-256: 43e7100580ccc99404b0a09d8cfaa51bc1bb2bf73f9efc6c6a3d41599d4cc373
font_01_sfnt_off0000fccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 11108 bytes
SHA-256: 8681305dbe35880bd7417adfdb5a9d55cc68333d9dc49f0ca37804a7454bc7e8

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