Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a92ff949f6dd464…

MALICIOUS

PDF

82.8 KB Created: 2021-03-21 07:58:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0fab061092851ca2bcd93eb7a994c6eb SHA-1: 9a3a83288b7938fa5f2b1dd7864a8bb61f807ab4 SHA-256: 4a92ff949f6dd4643f81efb5a74af0cd20c6b36ec64c99e611c1f6a7e83d32ea
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support this assessment. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lead users to potentially malicious content, aligning with phishing or malware distribution tactics.

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 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://mezovuduw.ru/123?utm_term=old+bengali+comedy+movie PDF link annotation
    • http://ramifapufebi.scienceontheweb.net/anatomy_and_physiology_coloring_workbook_chapter_4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465703/normal_5feed3dac6e88.pdfIn PDF document text
    • http://suzupuwejal.mygamesonline.org/restaurant_business_plan_format.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/h8NY1ib/13772163965.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455658/normal_604b31fb6bf7d.pdfIn PDF document text
    • http://didazema.mypressonline.com/how_to_fix_dryer_wont_start.pdfIn PDF document text
    • http://vetovikaxu.mypressonline.com/ipa_consonant_and_vowel_chart.pdfIn PDF document text
    • http://saripituxupagek.sportsontheweb.net/cat_syllabus_2020_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/jZifhg4/94825300979.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375518/normal_5fcb70652c7e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446773/normal_5ffbd91bcd425.pdfIn PDF document text
    • http://rakadan.sportsontheweb.net/panasonic_landline_phone_canada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417818/normal_5ff21b7958f38.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/nurobeduzeranosibuvid.pdfIn PDF document text
    • http://damewumesigalut.medianewsonline.com/54063038125.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/208d1507-8b47-4de7-bd59-18d49dd642f7/factoring_polynomials_double_grouping_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f38f994f-d198-4570-8b45-22f3f925dac5/latujowibomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c8d08fa-6708-4781-8e51-26c523d240b8/el_reino_de_este_mundo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3b8f516-7c59-4e9b-9bce-0df11542c2fb/how_to_draw_easy_stuffed_animals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a61f2e7e-080e-4dda-a42b-29bcdde71388/how_to_start_the_mantis_tiller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3081ff2-fb44-4dd8-9da1-763754d9130e/paragraph_editing_worksheets_grade_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/388c852f-a8cc-4439-a1b3-94cd09561e08/spaghetti_in_a_hot_dog_bun.pdfIn PDF document text
    • http://wuragumok.atwebpages.com/banana_boat_song_ukulele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e98dee7e-e232-419e-b5c8-14027d9796e4/37198095367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41ddbd8b-348d-4622-833a-0a6f37bb313c/sonicwall_tz_105_setup_guide.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_off000100ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 5312 bytes
SHA-256: 4c4ef35e55a67d434091f5b512a17f9945325cf4128f021a0086dd2b87dccdd6
font_01_sfnt_off000112c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C9 13332 bytes
SHA-256: 552a6c0c9e7c45a00595445642a3c9953506d7aa411c0f6840a1d434689c83ab