Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce4100456177cbed…

MALICIOUS

PDF

82.2 KB Created: 2021-03-08 23:02:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: e94751f697689f01ceb4ad0f97c209d5 SHA-1: 904bf5ccadaf0c04af258052de13cb457004081f SHA-256: ce4100456177cbed8a1a3eda4058456d3c0297920f93823453322d4041d9cfa7
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 0.9995

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://midufefew.ru/123?utm_term=material+discrepancy+report+form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366384/normal_60293a4b15e3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455681/normal_5fee2fb65f58f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379237/normal_5fcf7b7a0f52f.pdfIn PDF document text
    • http://wimazosuwoxugij.66ghz.com/97084717019.pdfIn PDF document text
    • http://zatodawu.iblogger.org/gastroenterology_journal_submission_guidelines.pdfIn PDF document text
    • https://wumaluruporemad.weebly.com/uploads/1/3/0/9/130969386/fd4dd830c4179.pdfIn PDF document text
    • https://tuzutetenufiro.weebly.com/uploads/1/3/4/7/134716615/e1d31fb.pdfIn PDF document text
    • https://gevotasi.weebly.com/uploads/1/3/4/3/134389209/guveporukir-texake-lixexoruwaren-sefidowidugez.pdfIn PDF document text
    • http://gefaveje.22web.org/pandora_box_3_game_list.pdfIn PDF document text
    • https://podogavefa.weebly.com/uploads/1/3/1/4/131438056/ca77ddc5b47e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384647/normal_60061078e358f.pdfIn PDF document text
    • https://weduparazibad.weebly.com/uploads/1/3/4/7/134710999/fupuvigig.pdfIn PDF document text
    • https://wegenagozej.weebly.com/uploads/1/3/5/3/135394478/jujagevuxokal.pdfIn PDF document text
    • https://gigazafopojub.weebly.com/uploads/1/3/4/0/134040382/736a82283dc2.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://fb5b3b17-6e6a-47c5-ae49-26eddba71e57.filesusr.com/ugd/aff7be_a81a7a1acdda48d29a749aaef5ba42ec.pdf?index=trueIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_6ce4a678c5614d13a383abbfaf558120.pdf?index=trueIn PDF document text
    • http://sikamavidasatam.epizy.com/breakup_party_status.pdfIn PDF document text
    • https://d451e762-8e00-4155-9971-9512d28d2528.filesusr.com/ugd/b52961_582a19c6f6184bc7b126833dda1fd676.pdf?index=trueIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_84b87f6374eb4fc8adc32de287ee52ee.pdf?index=trueIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_9249bb82ebd1429a956f07534d40b01b.pdf?index=trueIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_3b34886a9a9a49b2809bea01dbfab19b.pdf?index=trueIn PDF document text
    • http://xoxitazowakovit.rf.gd/16906964627.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_off0000f78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78D 5196 bytes
SHA-256: adb4fad3fc8df2d11bcff29521c1ba38043570afb7142a87625af5260d8b480b
font_01_sfnt_off00010925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10925 10520 bytes
SHA-256: 2e55ea7fe14596bba1fa799f0a1a192fea1fb431185ef4d700509c63085a6792
font_02_sfnt_off00012d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D18 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e