Malicious PDF — malware analysis report

Static analysis result for SHA-256 df40dfd778f54e1f…

MALICIOUS

PDF

79.5 KB Created: 2021-03-25 13:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 73ca338cf3454342c39818ab034fa3bf SHA-1: 5b195aeb0cbb2cac322fe7b60cff3d2bd20eb9bd SHA-256: df40dfd778f54e1f50f1d9e6c613331d729906ec9eb06da92d2754e93599ab3b
186 Risk Score

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 0.9998

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://dafemum.ru/wix?keyword=toshiba+laptop+repair+manual PDF link annotation
    • http://lijovafe.22web.org/19071295988.pdfIn PDF document text
    • https://bozoxemupep.weebly.com/uploads/1/3/4/3/134317316/5479316.pdfIn PDF document text
    • https://panelaxefejavej.weebly.com/uploads/1/3/5/3/135306159/57d6bce56b.pdfIn PDF document text
    • http://jovekasad.iblogger.org/60084917727.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kuboki/understanding_computers_today_and_tomorrow_15th_edition_chapter_2.pdfIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_5a35c696642449beafa29682a32eb580.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xabalaru/rujomexapigoxadik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d252b398-e1d1-452b-84fd-d411133591d6/29064708280.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48a4239e-ad8c-40af-8414-eee5737bb95e/youtube_poker_cash_game_2020.pdfIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_c91d9410ad484037801bd10279d686f4.pdf?index=trueIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_4c8d4f7dbd4d49a1b3b9a8dfaa8c72d6.pdf?index=trueIn PDF document text
    • https://a35b4eae-300a-44a5-b982-8d633984e519.filesusr.com/ugd/19735e_78ec1210dd5a4bdd9cfd6ac0341d367e.pdf?index=trueIn PDF document text
    • https://00eaa6b3-f026-4720-b00f-fafb40066352.filesusr.com/ugd/d498be_b0a1883b0e49474ea2b07e50a9578d21.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tiniruru/do_beats_have_noise_cancelling.pdfIn PDF document text
    • https://3f3b26af-a357-4ab7-b723-baa2d0f6bb2b.filesusr.com/ugd/5d6e2e_8b5b8868cc574afa82d5c763a32d9e9e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5868caa0-7a2d-4193-8e1f-8752c2b5e93a/piano_adventures_level_3a_lesson_book_2nd_edition.pdfIn PDF document text
    • https://d6bf9bfb-c092-4b17-ab9f-91da83e6a9d2.filesusr.com/ugd/d7ad14_38d30406532847dc87e3909d4a54f5af.pdf?index=trueIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_a6a2f650df2841618819edba8e94dad3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b0e7a04-bdfe-4e59-b041-bb46eb3f7018/how_to_operate_haier_ac_remote.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC54 5028 bytes
SHA-256: 00dff9b4dffe58bad6e80af5236eb92ee780b45bbc631d345fc6193abb982f1a
font_01_sfnt_off0000fd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD35 10992 bytes
SHA-256: 09edcae2af871a3a110ff68619a0fd967d58acc32136aba7ea10295a0cc9e0fb
font_02_sfnt_off000122e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E9 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34