Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac858dcb5b646e6…

MALICIOUS

PDF

80.8 KB Created: 2021-03-20 04:24:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c09d378aca996cb7e2db0e01e0e81f9c SHA-1: af0e26a4790a5424fba1a3d16ceeef3c24331e15 SHA-256: 6ac858dcb5b646e660ca2b55f60a52119ef9a995bedd750bfe9aa36db9556323
156 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 0.9993

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 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.
  • 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://zajinet.ru/strik?utm_term=what+is+the+best+software+for+qualitative+analysis PDF link annotation
    • http://sagedix.medianewsonline.com/descargar_biblia_paralela.pdfIn PDF document text
    • http://hookup153.site/97556404932tylm8.pdfIn PDF document text
    • http://olymptrade.buzz/netgear_nighthawk_c7000_vs_motorola_mg7700ankyt.pdfIn PDF document text
    • http://gejesixave.scienceontheweb.net/83941293905.pdfIn PDF document text
    • http://energierecrute-emplois.com/jomajadivubewolujafedoxp5f1.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/66661469951.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/entry_level_cloud_computing_jobs_london.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/windows_10_usb_boot_image.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/finite_element_method_magnetic_induction.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/liberal_arts_math_2_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5de8ef5-c86a-4ff1-8b75-f8ec2ed3a35b/hayward_sp3400vsp_ecostar_vs_variable-speed_pool_pump_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/fugujazagenujakope.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/punjabi_movie_audio_songs_free.pdfIn PDF document text
    • http://vawanumezal.onlinewebshop.net/25076885906.pdfIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_d74b7654932941dab7bd5df26153cebc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/20128623885.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ab7ece5-2ad2-46c8-bf95-b3795e0b5ccc/my_samsung_dryer_wont_heat_up.pdfIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_708f1500b93646bd826f46271f378df2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fomudebipefasu/how_to_start_ryobi_2000_psi_pressure_washer_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ff76a7a-2468-40ab-b9a5-1663ee6a291e/59928510804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25781637-10aa-4d4b-9a3d-e56933673f24/lg_washing_machine_replacement_washer_drain_pump_motor_4681ea2001d.pdfIn PDF document text
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_00b44918fa3e4bdda7b3af57d9675e11.pdf?index=trueIn PDF document text
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_2e016c3921174c8dbfec380244fc5c3f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/daselex/tologeserufewoditasupajej.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/foxubedowe.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_off0000ff6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6B 5388 bytes
SHA-256: 120439966c9ceaf02b2a28d70bab6f1697e1eef731edc1e0e4a6cea8c2bb28d9
font_01_sfnt_off000111df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DF 10496 bytes
SHA-256: 60b763cf33594a57fd8120eb1283e05ad2e810f7d8f9d366be069208235a061d