Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0c9b850e734602f…

MALICIOUS

PDF

90.3 KB Created: 2021-04-05 17:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1e4d039cc5ee5a6fc6517ce487a1a224 SHA-1: c44d2abfa5fdf307dc6a3c23aa73484e3216eb64 SHA-256: b0c9b850e734602fd85ab66766ae76604992a0d1bf5590d277231d155d12a4a4
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 0.9994

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://golowaki.ru/123?utm_term=interdependence+of+plants+and+animals+worksheets PDF link annotation
    • http://albatros-trans.ru/whats_my_zodiac_sign_by_monthg1dbd.pdfIn PDF document text
    • http://vajesafosedepur.mywebcommunity.org/causative_exercises_b2.pdfIn PDF document text
    • http://1cats.space/94433504502jeaq7.pdfIn PDF document text
    • https://ragusixiseditof.weebly.com/uploads/1/3/0/8/130814169/541dd73b.pdfIn PDF document text
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/8959355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466662/normal_601ceb62730d9.pdfIn PDF document text
    • http://mebotus.mypressonline.com/zexesafipuninovata.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380545/normal_6004a8de04013.pdfIn PDF document text
    • http://novonet.online/roku_streaming_stick_plus_vs_ultra_2020uh6yp.pdfIn PDF document text
    • http://roskycnmx.com/cultivo_de_arroz_organico_en_ecuadorg2b17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443814/normal_6031c582ce005.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/wheel_horse_2_stage_snow_blower_for_sale.pdfIn PDF document text
    • http://fofumumitem.medianewsonline.com/jurupubevaxowexepuxi.pdfIn PDF document text
    • http://javosewo.sportsontheweb.net/wazog.pdfIn PDF document text
    • https://posajegodat.weebly.com/uploads/1/3/4/4/134477503/besaxinali.pdfIn PDF document text
    • https://gafeziluwer.weebly.com/uploads/1/3/4/3/134310472/5347ac4.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/who_is_the_best_criminal_lawyer_in_texas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368748/normal_605d89ab7d217.pdfIn PDF document text
    • http://lg-supportteam.com/alcatel_7210_configuration_guide4nt4y.pdfIn PDF document text
    • http://xepewifub.mygamesonline.org/58099622169.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/48175149183.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC13 6440 bytes
SHA-256: 629123bfde0685c5f69bbdd27ec008bde0224d5c30af1dabb990f6ee33ea778e
font_01_sfnt_off00010c07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C07 5488 bytes
SHA-256: e15f39627481771cdc3db3aeb43d5f710ee9ff1068f15b237261b79d4e3279c5
font_02_sfnt_off00011e99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E99 11500 bytes
SHA-256: 0f500b4133153f020b581b02b1818f3fbbb80f9e1d252d821a5e64d4dfc58d01
font_03_sfnt_off000145ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145AE 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b