Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbc1f734ccd3f85…

MALICIOUS

PDF

90.7 KB Created: 2021-03-24 02:56:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 515c5fe3f42c8f644df84b13a568b3ec SHA-1: 5e2fd2c0a4b8b6af027c29103afccd739be308e5 SHA-256: 4fbc1f734ccd3f85fc6e859b9dd5ead1a55191b329b1da8bc3a182750074c089
186 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 0.9997

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://xajibur.ru/award?keyword=mapamundi+para+colorear+pdf PDF link annotation
    • https://cdn.sqhk.co/bubiwalifeda/iejdMih/77977791800.pdfIn PDF document text
    • https://cdn.sqhk.co/metexemoraga/fhgdp4d/daftar_kode_meteran_listrik_pulsa.pdfIn PDF document text
    • https://voxaxaloxedifuz.weebly.com/uploads/1/3/5/3/135399296/loredewizav_pukaxoli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413458/normal_5fe0a02147108.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418566/normal_5ff85a8f2863d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378618/normal_5ffbe19fbad33.pdfIn PDF document text
    • https://cdn.sqhk.co/nepajenine/hgibhft/92645207940.pdfIn PDF document text
    • https://larulesa.weebly.com/uploads/1/3/4/7/134717423/texezejimomi.pdfIn PDF document text
    • https://cdn.sqhk.co/lutidofele/hiESgfb/fokaxenamuzitolexa.pdfIn PDF document text
    • https://cdn.sqhk.co/pulisamog/Yaifijo/28969003142.pdfIn PDF document text
    • https://cdn.sqhk.co/wukiratuxazo/Ajcwiag/32493443754.pdfIn PDF document text
    • https://cdn.sqhk.co/mofijovelu/iijgjgp/sirapawozageduxasuvur.pdfIn PDF document text
    • https://cdn.sqhk.co/mudaxomemut/0c6gduO/like_father_like_son_1987_rotten_tomatoes.pdfIn PDF document text
    • https://xoludifatak.weebly.com/uploads/1/3/4/4/134477652/fupinegusituwig.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/lezopobigeza/karcher_k2_compact_parts_list.pdfIn PDF document text
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_be7f2a4649db44f68c936a8b23d5f760.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/87842623821.pdfIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_ea75f18fb1ee4e36b9164bbec95470eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/takurugilij/good_food_guide_2020_melbourne.pdfIn PDF document text
    • https://s3.amazonaws.com/xilasisefi/cazadores_de_sombras_los_origenes_principe_mecanico.pdfIn PDF document text
    • https://e7ba4f66-d023-404d-a355-a5b98970f127.filesusr.com/ugd/cac9e4_175dcc2f71de4e41941fb58760924d7c.pdf?index=trueIn 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_off0001216e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216E 5128 bytes
SHA-256: 4a6a6b8fe9350cfa8ce7ce231b4d21188355adbc94c958f577950bab9bb5cb85
font_01_sfnt_off000132d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D7 12724 bytes
SHA-256: 6ee376f1b57b361d8b00e137b45391a4cbb028674a3d90624138b238427c5d13

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