Malicious PDF — malware analysis report

Static analysis result for SHA-256 352f39323a1a07fc…

MALICIOUS

PDF

95.0 KB Created: 2021-03-15 21:13:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0247de28cb178de1643d2402e6e4f224 SHA-1: 9649f63294f8940a8016e546c8286c22e77311d5 SHA-256: 352f39323a1a07fce679899c8bdc328e074f253ceec80d577c351693347caadd
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags the document as a link farm on disposable hosting, reinforcing the malicious nature. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://botokaw.ru/award?keyword=oxford+dictionary+complete+pdf PDF link annotation
    • http://lubozamesorox.iblogger.org/crm_reporting_tools.pdfIn PDF document text
    • https://cdn.sqhk.co/lokiwejawe/ijTgggd/reglas_de_nomenclatura_de_alcanos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465924/normal_5fd82c8def943.pdfIn PDF document text
    • http://ziwusis.getenjoyment.net/pioneer_vsx-819h-k_service_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/wusezofetib/aggKcjb/waukee_ice_cream_shoppe_menu.pdfIn PDF document text
    • https://cdn.sqhk.co/jowowibow/jcgdgf6/nonstop_balls_mod_apk_1._3._6.pdfIn PDF document text
    • http://jexekiraj.sportsontheweb.net/multivariate_normal_distribution.pdfIn PDF document text
    • http://zezasarasojid.mywebcommunity.org/is_dark_green_a_calming_color.pdfIn PDF document text
    • http://takipibimaxubov.sportsontheweb.net/can_you_keep_a_secret_song_nightcore.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391302/normal_6002fe4da541c.pdfIn PDF document text
    • http://jaraxusej.iblogger.org/jaundice_blood_test_report.pdfIn PDF document text
    • https://cdn.sqhk.co/nigigeje/NThc2Mc/32829051113.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/naxilikuvik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453532/normal_5ff37462163bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369158/normal_603b028e385f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379217/normal_5fec8dc25fed2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuzezufomazo.rf.gd/wopuwizivibufuzev.pdfIn PDF document text
    • http://bototiluwoge.atwebpages.com/how_much_does_it_cost_to_start_an_indie_game_company.pdfIn PDF document text
    • https://s3.amazonaws.com/voxazedisula/hydro_test_report_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/67637002156.pdfIn PDF document text
    • http://bojibag.epizy.com/hawks_nest_weather_report.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/36909503292.pdfIn PDF document text
    • http://radiviwix.onlinewebshop.net/the_night_manager_streaming_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/absentee_voting_form_new_york.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/camera_360_samsung_apk.pdfIn PDF document text
    • http://kukolugirutufu.rf.gd/50092326015.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_off00012c31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C31 5320 bytes
SHA-256: fd63e4bf8683ee57a1410a11dcecfa6cc00443f32f208b7b0bba7ddeec1000a5
font_01_sfnt_off00013e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E42 16404 bytes
SHA-256: 411f0b051642db867cbdee441f8bb8ed310a20633c9914abe20567755e79331f