Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ef1e93bd1e46787…

MALICIOUS

PDF

74.0 KB Created: 2021-03-09 10:52:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d3375e3a796194895e4d068964e6035b SHA-1: e10c1ff1f8e41921ffb873a444ea6e40c136fbaa SHA-256: 7ef1e93bd1e4678775c873e769604b6fdf20ef31152a2a6cbde348c88a953052
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The document body, though heavily obfuscated, contains references to a 'seven little words game' and numerous external URLs, many hosted on disposable domains, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the link farm heuristic strongly indicate an attempt to redirect users to malicious content.

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 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://nipisod.ru/123?utm_term=seven+little+words+game PDF link annotation
    • https://fexalikinuzumow.weebly.com/uploads/1/3/5/3/135324316/418b54.pdfIn PDF document text
    • https://nexuragero.weebly.com/uploads/1/3/4/7/134751893/b735fb4ccf2f6e.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/chbjeig/kejonabatawotuza.pdfIn PDF document text
    • https://cdn.sqhk.co/lunemitibojo/Mjegh1I/62940865168.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/binujobinogoza_fefumiwi_jatewefosekeme.pdfIn PDF document text
    • https://cdn.sqhk.co/tujarazimok/dhhDuib/kung_fu_hustle_landlady_costume.pdfIn PDF document text
    • https://ruparowix.weebly.com/uploads/1/3/4/3/134350000/bixuvol-pojepu.pdfIn PDF document text
    • https://cdn.sqhk.co/kofisosiz/gCQTJmi/instagram_photo_downloader_for_iphone.pdfIn PDF document text
    • http://pavaverijakat.iblogger.org/713000295.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/gixirojozogufux/43939551574.pdfIn PDF document text
    • http://rowomasogig.epizy.com/final_cut_pro_7_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/auto_electrical_training.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/59303544513.pdfIn PDF document text
    • http://rinexevijexaxi.epizy.com/gidaxulele.pdfIn PDF document text
    • http://zikinevubebera.epizy.com/34111138654.pdfIn PDF document text
    • http://kugibujupedo.rf.gd/23307141372.pdfIn PDF document text
    • http://wabipoxagapez.rf.gd/42029206475.pdfIn PDF document text
    • http://delixerilebuk.epizy.com/akkurat_std_font.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/62477756795.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_off0000e4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 5400 bytes
SHA-256: b5b3475bbda7ef34ac8078f61b8b72eb1fb7b5f0fee5f60ac39288b707b7aa3b
font_01_sfnt_off0000f74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74A 10432 bytes
SHA-256: cd581f7eca52521753c3d57172a12c0fc27dd117e2e6ea87f52a59410b0a94da

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