Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f649ec5588f81a…

MALICIOUS

PDF

78.7 KB Created: 2021-03-27 19:58:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a3e1736bc3194897deb54dc0dbd6931c SHA-1: 5243811f0b7ff63120d177ac336720063c1c7d02 SHA-256: f2f649ec5588f81ad89e0666f3ccff1522d4fdd3ef1adad4de60c8f1dc9abf80
186 Risk Score

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 0.9996

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/award?keyword=nomenclature+of+alkanes+pdf PDF link annotation
    • http://frontglass.xyz/brother_hl-2140_ink_refill4rb8r.pdfIn PDF document text
    • http://femuxeririta.mygamesonline.org/aeolian_scale_guitar.pdfIn PDF document text
    • http://puzodidifixo.iblogger.org/30963651462.pdfIn PDF document text
    • http://shtangye.xyz/73272601568kno2g.pdfIn PDF document text
    • http://sis-paypal.com/954536497058t2kq.pdfIn PDF document text
    • http://mizejodaf.mywebcommunity.org/recurrent_and_capital_expenditure.pdfIn PDF document text
    • http://tujozavido.66ghz.com/beats_pro_wireless_android.pdfIn PDF document text
    • http://tezuveripoxub.mypressonline.com/zetebimobezorave.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/gomakobez/xofarato.pdfIn PDF document text
    • https://6d5fec37-5936-4ae8-8938-03a86e982f09.filesusr.com/ugd/d4da64_fd205d44127e44feaad3a1d87c5fb1aa.pdf?index=trueIn PDF document text
    • http://kuparego.rf.gd/naming_aromatic_compounds_worksheet_with_answers.pdfIn PDF document text
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_888ab0cb10b3439da70d8b55ab8b6b90.pdf?index=trueIn PDF document text
    • https://801a9f91-e12c-4b3a-b535-42c3eaff61c8.filesusr.com/ugd/d237ef_d4e02fd638474673bb3c483a60453080.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_df1fcec96bb043a2abeb0af667a92520.pdf?index=trueIn PDF document text
    • https://aa0e52d0-3c12-4d86-bfd3-e3284f950a51.filesusr.com/ugd/eb1974_28c9334da64f4bfda9b4a26de31ac36d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/57760757990.pdfIn PDF document text
    • https://7e574f8b-ef34-4833-8dee-b18f3ac9fc91.filesusr.com/ugd/af8ffd_7a7a8ec8025b4e20a8e4251cf99af4ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jufowokedunod/8197431256.pdfIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_7e5c7109913647f09bb29bd0cc4157dc.pdf?index=trueIn PDF document text
    • https://71bfc0c6-4bef-405a-aee6-9e9dcaab3d12.filesusr.com/ugd/708cfd_7d434677f748431280c626c874658246.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/xavubavifofodazuwom.pdfIn PDF document text
    • http://furunes.onlinewebshop.net/23451006148.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_off0000f7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EA 5336 bytes
SHA-256: 69e687486d796260f330ee5ae2c8d062473434e607dccaa2557ffb7325d9f698
font_01_sfnt_off000109fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109FE 10316 bytes
SHA-256: 609cefa5ada2346580566ba1d55b2aa61a68e309f8995dd064fe75596bf823e1

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