Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3357316187a9605…

MALICIOUS

PDF

74.2 KB Created: 2021-03-02 07:21:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 34ec88f7ba7e8b5cb2ce9237644856a6 SHA-1: 5976d1d47f419f06359eca1938ab9750fea6608d SHA-256: f3357316187a960526502de2ccf6cc7d32956074d62949afebb4f9c7b8daad96
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a large number of external links, many of which point to potentially malicious domains, suggesting a link farm or phishing lure. The PDF structure itself is also flagged for containing numerous external links, further supporting the attack pattern. Although no scripts were explicitly extracted, the PDF format often utilizes JavaScript for malicious actions, and the presence of external URLs strongly suggests a phishing or malware distribution attempt.

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://botokaw.ru/wix?keyword=periodic+trends+gizmo+answer+key+activity+b PDF link annotation
    • http://instas.site/namirolwbfif.pdfIn PDF document text
    • https://nukofagola.weebly.com/uploads/1/3/4/8/134883999/zetobu.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/download_free_comic_books1vi2y.pdfIn PDF document text
    • http://help-verifiedbadgecenter.com/ligapusovenurulatexuphokt.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/cyKia8F/70034834874.pdfIn PDF document text
    • http://alfa-quest.ru/brawl_stars_game_for_android4h59r.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/9hdjeoF/ice_cream_cake_recipe_mint_chocolate_chip.pdfIn PDF document text
    • https://lasarowolu.weebly.com/uploads/1/3/6/0/136024073/3963818.pdfIn PDF document text
    • http://feedbacrnz.space/does_lg_refrigerator_have_a_reset_buttonyb5tt.pdfIn PDF document text
    • https://cdn.sqhk.co/vebapejun/jevhghi/23610802189.pdfIn PDF document text
    • https://faripolugariwel.weebly.com/uploads/1/3/1/4/131453512/e0fae2a924f12.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/pobixedele/capnography_book.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/37679727420.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/baled.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/16665718488.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/85040083795.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/calculation_meme_format.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_off0000e44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44F 5736 bytes
SHA-256: 485b3aafadc806ddc9d473ce13b1da67486c9e087872eb41ce4889cf64d7fa01
font_01_sfnt_off0000f7e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E8 11056 bytes
SHA-256: 31a28ebe7c5902bc0fa41116518ca841b9200bcf7feda6f3d4126acd2211f000

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