Malicious PDF — malware analysis report

Static analysis result for SHA-256 3292a8a4589b4947…

MALICIOUS

PDF

85.8 KB Created: 2021-03-04 06:55:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8a2280bdc7955d0afc79ff9e98002f61 SHA-1: 63a713d924ea2a2e984a392c220f622a6e69542a SHA-256: 3292a8a4589b4947f67ecd075ccb8f1e539554c57c1088380b574d19caa768c1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'biology lab report format template'. No scripts were extracted, but the numerous external links are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://jottigo.ru/strik?utm_term=biology+lab+report+format+template PDF link annotation
    • http://dewisazovuvoxi.mywebcommunity.org/the_maze_runner_3_movie_download_in_hindi.pdfIn PDF document text
    • http://naturebiolog.fun/nebaxipowezatusutag5qrlq.pdfIn PDF document text
    • http://wazepewazivulil.mywebcommunity.org/wobabenuxasuriwizibowem.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/a_long_obedience_in_the_same_direction_review.pdfIn PDF document text
    • http://woxuruko.medianewsonline.com/96945904803.pdfIn PDF document text
    • http://tufuwavaziga.mygamesonline.org/42776945291.pdfIn PDF document text
    • http://erogan-columbia.site/how_to_adjust_pfister_shower_temperature8f5wm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450037/normal_6023c6d88dfc8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414501/normal_603b785cf2b53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462341/normal_6029ac1738798.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391907/normal_5fe3a0da76414.pdfIn PDF document text
    • http://igcopyrightclient.com/85148822373x5zbe.pdfIn PDF document text
    • http://naturwows.space/mufawegcnby.pdfIn PDF document text
    • http://liko-sneakers.com/nozorelizujowigomf667.pdfIn PDF document text
    • http://kakolamilasaru.medianewsonline.com/how_to_find_missing_angle_measures_geometry.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496828/normal_5ffa9b84838cf.pdfIn PDF document text
    • http://oneitshop.info/engagement_party_invitations_templatesp7buz.pdfIn PDF document text
    • http://lnstagramsupportingcenter.com/16009982336k7g0h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duxegejuw.atwebpages.com/they_say_i_say_3rd_edition_isbn.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/sharepoint_designer_2013_end_of_life.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_off0000fc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC22 5332 bytes
SHA-256: bbf9408851c7ecab7592ca50d037adfd0bb9ad9e1251564c3af10cef351d0c07
font_01_sfnt_off00010e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3E 10844 bytes
SHA-256: 806afc2349fce1f2222b6b770c2cf9901db22bf7284506534673b7526548d1a6
font_02_sfnt_off00013354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13354 16328 bytes
SHA-256: b5fbaaa4af9b36882f9d831a885ef238a37545ab26d417bac7d8f56cddfd7376

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