Malicious PDF — malware analysis report

Static analysis result for SHA-256 420fa2854dafe0ec…

MALICIOUS

PDF

151.3 KB Created: 2021-04-05 03:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1f96c0728d8a3b2a05b32bda9266a662 SHA-1: 1290ac915d12317741dc3dbf8177324ab3ddfff1 SHA-256: 420fa2854dafe0ecfb28b18871c138a25d8387240f12aec325c4300802d6493c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9987

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://ponafet.ru/award?keyword=agricultural+science+grade+10+study+guide+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384640/normal_5ff5e9a4ab200.pdfIn PDF document text
    • http://fixmarker.fun/gosenirawapunebubedumirlu9rs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482426/normal_6040f56ae79e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446286/normal_605146e58aa6c.pdfIn PDF document text
    • http://zerulowomuv.22web.org/que_es_epistemologia_en_filosofia.pdfIn PDF document text
    • http://natlegend.space/many_brick_breaker_3du5c6g.pdfIn PDF document text
    • http://vugijow.iblogger.org/how_to_transfer_to_kindle_wirelessly.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498834/normal_602214725ec57.pdfIn PDF document text
    • http://alcozerox.com/36998904453odyne.pdfIn PDF document text
    • http://phillipen.online/7704334461806v96.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457330/normal_5fedf769ba42e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sazitoza.epizy.com/gm_financial_credit_application.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8c895f8-11f1-485c-abd5-33b29af33436/10th_class_physics_formulas_free_download.pdfIn PDF document text
    • http://rumajajoneder.rf.gd/85871316963.pdfIn PDF document text
    • http://xuziruwunev.rf.gd/lakaxusegafojedofu.pdfIn PDF document text
    • http://monigadukuze.rf.gd/where_can_i_donate_furniture_in_montreal.pdfIn PDF document text
    • http://wijarixeva.rf.gd/labeled_map_of_south_america_with_capitals.pdfIn PDF document text
    • http://diwevobu.rf.gd/6122109951.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/903547cd-e312-46bc-9685-cd49936594a5/jumper_lyrics_kina_grannis.pdfIn PDF document text
    • http://vijesir.rf.gd/vsco_full_mu.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/what_constitutes_a_valid_e_signature.pdfIn PDF document text
    • http://gonesipida.epizy.com/50775523772.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/behringer_neutron_manual_deutsch.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001fc9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC9A 5700 bytes
SHA-256: e6fe8195413963ce03f3f398948ab4ba67f5d473fc5d47ff2f3eddb3c5db1d0c
font_01_sfnt_off00021033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21033 12224 bytes
SHA-256: 3881604252e3e638ae5df77ed6d7966201c949cb8d1e4cf8cedd613c846d5245
font_02_sfnt_off00023903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23903 16292 bytes
SHA-256: b4be33432bae3e3720616daa84b4e69962889ad65177710fabc9d7d8a955f9a8