Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a277feeb2bb97db…

MALICIOUS

PDF

74.5 KB Created: 2021-02-02 00:42:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b4ee71b9bce7def21219106087cfba96 SHA-1: 37d5807616ff617a7481b1dcd2a92b7f6767663c SHA-256: 4a277feeb2bb97db2c8010f566e91cd04e48c0a58b7a4761b767f0ec7cb20b65
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV also flagged this file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the presence of numerous external URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/123?utm_term=thurl+ravenscroft+you%2527re+a+mean+one+mr.+grinch+live PDF link annotation
    • https://cdn.sqhk.co/wubunepan/c4z6ifM/big_boy_games_to_play_for_free_online.pdfIn PDF document text
    • https://tojumofudino.weebly.com/uploads/1/3/2/6/132681199/7449145.pdfIn PDF document text
    • https://cdn.sqhk.co/japewaturu/jgfgepV/61197668945.pdfIn PDF document text
    • https://kiriwalukejogof.weebly.com/uploads/1/3/4/3/134310578/5277306.pdfIn PDF document text
    • http://lnstagramcopyrightcenter.com/38568206015fasx7.pdfIn PDF document text
    • https://rorezumi.weebly.com/uploads/1/3/4/5/134591247/3618456.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/jenagubadopi/intermolecular_forces_liquids_and_solids_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/97944598652.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/types_of_amnesia.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/impostare_account_alice_mail_su_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/wutesoso.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/litoxatetesi.pdfIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/guide_critiquing_photographs.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_off0000e334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE334 5472 bytes
SHA-256: d2fc05b8b3a5bdd45d3d7e2ad12d5f1c3adfec8676c1227da7912bcdddd4e5e1
font_01_sfnt_off0000f5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C2 11400 bytes
SHA-256: 77b0c51c6b033a17b90e18a0f1078206bad7cdbf2fd2632700d6d4176088008b

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