Malicious PDF — malware analysis report

Static analysis result for SHA-256 2709d0ffa09cdd78…

MALICIOUS

PDF

82.9 KB Created: 2021-03-24 02:33:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6c41b2feddb6d6f9e2f8107dc524d0f5 SHA-1: fd70213e42a2bd82353b077160e286265e5bc9ea SHA-256: 2709d0ffa09cdd78fa6e3677a8b1ca97a3ba43840fd437c48698d7ab46391282
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://resalured.ru/award?keyword=allegra+bula+pdf+anvisa PDF link annotation
    • http://lozhobelir.space/sarah_j_maas_crown_of_midnight_series4p18l.pdfIn PDF document text
    • https://zipawesijapa.weebly.com/uploads/1/3/4/4/134494223/wineges_ridefazodap_sozavuz.pdfIn PDF document text
    • https://zipiluzus.weebly.com/uploads/1/3/4/2/134234939/816595.pdfIn PDF document text
    • https://vuzaruluweketex.weebly.com/uploads/1/3/4/4/134478477/zevazug.pdfIn PDF document text
    • https://vixugusimuxomuj.weebly.com/uploads/1/3/0/9/130969476/6831251.pdfIn PDF document text
    • https://suzagosezamonu.weebly.com/uploads/1/3/4/4/134446802/5558039.pdfIn PDF document text
    • http://modernstyle.pro/11660376264v3pnx.pdfIn PDF document text
    • http://bimadepunepi.mypressonline.com/hp_application_lifecycle_management_tutorial.pdfIn PDF document text
    • http://loveworld.club/gutisonafifikaseleamhrg.pdfIn PDF document text
    • https://xazonulukobimov.weebly.com/uploads/1/3/2/7/132712199/5566877.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_fb83c6b8b198498aa0c2d45e02985db3.pdf?index=trueIn PDF document text
    • http://nisetekotixob.myartsonline.com/atlas_of_bethesda_system_for_reporting_cervical_cytology.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/standifer_gap_desire_of_ages_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dobesogum/buberez.pdfIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_18a432c6030d43fa8ee7c6723b506639.pdf?index=trueIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_a3905a9444234f77bba78052d538c5be.pdf?index=trueIn PDF document text
    • https://74a5c9af-61bb-4d76-9351-4d02c0bf652a.filesusr.com/ugd/e33828_13106ff588b34c70bd63282a85bab505.pdf?index=trueIn PDF document text
    • http://bodegifu.atwebpages.com/78590091868.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/mission_impossible_theme_cello_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/wozoxub/parquet_file_format_compression.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_off000100b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 5400 bytes
SHA-256: 3fe632c11605a22f26dbd3a0babe244796f0e9b539a86f452021e000eeb5e65b
font_01_sfnt_off0001131f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131F 14224 bytes
SHA-256: cad750a3ef05fef44dcf89b8a4adb22780c3df87826296274deca5201c622a73

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