Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ef3a9798dab1786…

MALICIOUS

PDF

74.3 KB Created: 2021-05-04 02:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 06b84da37579b9cd14feda1b20d3c3d3 SHA-1: 282779e18f9e7e8e51d479413c160d9d3d7d1e5a SHA-256: 0ef3a9798dab17861791b71614a644da057cb56f8943bb2b3917fd52f92d39a6
184 Risk Score

Malware Insights

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

This PDF file contains embedded links to known malicious redirector infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, suggests a lure related to car purchases, which is then used to direct the user to a malicious URL. No scripts were extracted, but the presence of malicious links and the high ML score indicate a phishing or redirection attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=things+to+be+checked+before+buying+a+new+car In PDF document text
    • http://pewujok.mypressonline.com/physical_science_grade_10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443824/normal_6065a45443f66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451545/normal_5fca584baf961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446162/normal_6010f5e07429e.pdfIn PDF document text
    • http://manovina.mypressonline.com/16902324783.pdfIn PDF document text
    • http://suzamakulamuj.mypressonline.com/17192071219.pdfIn PDF document text
    • http://puzexijabin.mypressonline.com/kawaropeb.pdfIn PDF document text
    • http://xonitaj.mywebcommunity.org/what_is_differential_theory.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/drawing_app_for_mac_online.pdfIn PDF document text
    • http://kudukudimox.sportsontheweb.net/what_are_the_two_visual_strategies_in_organizing_information.pdfIn PDF document text
    • http://tifebozazam.iblogger.org/74808110901.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_85e6e7adb4bb42448c83d130ffaff25a.pdf?index=trueIn PDF document text
    • https://538d8494-0c7d-401a-b890-0485f6bc7bca.filesusr.com/ugd/29c71c_83cdbeeda57946b9bad748504477617c.pdf?index=trueIn PDF document text
    • http://wenibeliso.atwebpages.com/sueo_de_una_noche_de_verano_william_shakespeare_pelicula_completa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/830af640-ccd1-4558-a251-764084f696dc/free_advanced_english_speaking_course_online.pdfIn PDF document text
    • http://vitorozakosi.rf.gd/dererezelane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0e2284d-88ca-44d4-9a5e-cd871e3fd1fb/29929458100.pdfIn PDF document text
    • https://d4f1f58f-bd44-402a-a4b0-a3aa01e36dbf.filesusr.com/ugd/dffefa_2da5c51a598644f4ab8d1bd4a67f2bf5.pdf?index=trueIn PDF document text
    • https://123949be-7110-4ba3-a240-a7df06fb38ce.filesusr.com/ugd/80fd5d_0d92fe68a1eb4cfcbd84fb65b1b56907.pdf?index=trueIn PDF document text
    • https://38e81cab-313f-462b-917d-d566bf782aa4.filesusr.com/ugd/36aba1_79d537386af1498b89bdbb16526549c5.pdf?index=trueIn PDF document text
    • http://fugufaza.myartsonline.com/around_the_world_in_eighty_days_movie_cast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a4198a0-a83f-43e4-a996-487b12b18b40/ged_practice_test_math.pdfIn PDF document text
    • http://nadedafusefemej.rf.gd/jurnal_biogas_dari_kotoran_sapi.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_off0000e4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 5600 bytes
SHA-256: 11884f5cf6cb00e6d46afa43aceeee2ba792cc42e9bf1f4aa608f247643bd1e3
font_01_sfnt_off0000f816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF816 10528 bytes
SHA-256: 0fb84cd61376324aacf1087bf714d36eef4dc2d951817275b3b342f7ab3a7bc8