Malicious PDF — malware analysis report

Static analysis result for SHA-256 a48320d1e2faa8f7…

MALICIOUS

PDF

116.9 KB Created: 2021-03-14 13:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d1e0572174fcdb68ec62cade571bb684 SHA-1: 55930c1ef800c51610ec80465cb4c07761d92c22 SHA-256: a48320d1e2faa8f7f844cf4e304a32498a6f749408e8f2e1c7502f7f142e98dd
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 0.9990

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://gimoguvi.ru/award?keyword=negative+feedback+amplifier+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4412415/normal_5fcbe06e40738.pdfIn PDF document text
    • http://jipolavex.medianewsonline.com/love_story_re_recorded_version.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/31534504464.pdfIn PDF document text
    • http://palaxofivuleduj.medianewsonline.com/bissell_powerfresh_steam_mop_replacement_pads.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414678/normal_6046619e2d589.pdfIn PDF document text
    • http://zodimasar.mypressonline.com/is_naclo4_an_acid_or_base_or_salt.pdfIn PDF document text
    • http://tamodemuror.getenjoyment.net/61869361026.pdfIn PDF document text
    • http://lexamopelezun.mywebcommunity.org/bpsc_prelims_2020_result.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481409/normal_5fe402951200f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5fda2b1615892.pdfIn PDF document text
    • http://tuvurebomiworo.scienceontheweb.net/1716898284.pdfIn PDF document text
    • http://bukuminuwakub.mypressonline.com/zulejubixuwus.pdfIn PDF document text
    • http://tesupelaj.sportsontheweb.net/environmental_impact_assessment_india.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_8968ab40a90d42f88f152f4665e4bd26.pdf?index=trueIn PDF document text
    • https://983c8978-ad56-435f-a988-47358aa6040c.filesusr.com/ugd/06a663_5d542b561fa44f2fb120ef133d6f4af2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd086fd-e072-456f-89ac-be4961a17838/63384615799.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/man_who_built_the_moon_chords.pdfIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_3de1a8c7a96642b2b143c0adf9637d0b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5f30ef0-1843-4395-a3c5-c411a56f4947/vexizenivoraripopo.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/is_one_touch_ultra_mini_accurate.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/lonoxilupaluwoxawikefufi.pdfIn PDF document text
    • http://fiforeru.atwebpages.com/muslim_baby_boy_names_with_meaning_in_urdu.pdfIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_75e229ecd4aa4533abeaa000da1f7e39.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/what_does_the_spotted_lanternfly_do_to_trees.pdfIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_8714a2245b894781b52ea1103e74503a.pdf?index=trueIn 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_off0001735b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1735B 5532 bytes
SHA-256: 8a522b25590d2ec6c79dd8c3b4bb11459621e0236d43520337af50309a29f3a5
font_01_sfnt_off0001862c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1862C 12388 bytes
SHA-256: 08d82b197fe043c05f71419e48b2e7647939b4d9398f78889f03c5e111901103
font_02_sfnt_off0001b090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B090 16176 bytes
SHA-256: 23e7bef8e063775ef50c078bfe8ce1c4a94524f36d3271b36a7c6c62c68101e5