Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea2d361d2173d1a9…

MALICIOUS

PDF

81.5 KB Created: 2021-03-08 09:17:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 413a7c8a5ff2e787c466c8abd5b1656e SHA-1: 9dceee6477cadb1b188f4175ba6e2ab09a04ee04 SHA-256: ea2d361d2173d1a93b407ef036339751c5935abc6cbeb4eff0305e055c29871b
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous external URLs, some pointing to disposable hosting, suggesting a phishing or SEO spam campaign. While no scripts were extracted, the PDF structure itself facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://lozipotod.ru/strik?utm_term=how+to+clean+cuisinart+coffee+grinder+dcg-20n PDF link annotation
    • http://vykupavto54.ru/sanesewevjoac5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471686/normal_60072d6e3d3ca.pdfIn PDF document text
    • https://mitometivu.weebly.com/uploads/1/3/6/0/136094147/towobozapumuxiluda.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497695/normal_5fe127b788e7d.pdfIn PDF document text
    • http://misstourist.info/it_company_interview_questions_and_answersz977p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449172/normal_6044fe3bb9a15.pdfIn PDF document text
    • http://napowojeba.medianewsonline.com/25922738790.pdfIn PDF document text
    • http://photoforce.ru/what_do_white_chrysanthemum_signify_in_japanese_cultureednb5.pdfIn PDF document text
    • http://hookup154.online/18645173d2p0a.pdfIn PDF document text
    • http://bostpolamos.site/how_much_does_a_restaurant_manager_make_in_canada080br.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/mebuleduxemokuvafol.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/how_to_say_multiple_times_in_french.pdfIn PDF document text
    • https://natadafupekex.weebly.com/uploads/1/3/1/8/131856288/zopatefibav.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/737b7295-c784-403c-b7ce-5268e181d915/88726768328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27be8b00-0231-46c4-8b85-5645baceb5ee/walt_whitman_song_of_myself_section_6_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7357306e-dc16-4324-ac13-fa8f37eb94fd/garmin_vivofit_4_fitness_tracker_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82dfbf12-2ae1-4b9f-944a-c2cc0fd3cf39/74665470586.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11586334-7267-489c-bd57-fe19faabeb65/what_is_the_use_of_reference_voltage_in_adc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e56c0a1-795e-49c6-abcd-12b4bd3c6c5c/what_type_of_text_is_an_autobiography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/173e34e5-70f4-494d-abae-e3df562decc7/arduino_vs_raspberry_pi_for_sensors.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49D 5548 bytes
SHA-256: b1ad6602ad83c375c5d271f5a7d8828f4c6c1d49e6f9fcef72d9f3eea92e5eac
font_01_sfnt_off0001079d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 3720 bytes
SHA-256: 6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
font_02_sfnt_off00011300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11300 10728 bytes
SHA-256: 8751883b42b39622b2eda317bc356fbc7f37dfe0eb4739d53405dc981c4e8a31