Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a2408084ac7cb9…

MALICIOUS

PDF

78.7 KB Created: 2021-03-24 23:52:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6337ea80508dad26c8c6f7e94f81a453 SHA-1: e11184b97cbf841faabe66781dd95b4b6009e525 SHA-256: 12a2408084ac7cb9f94d239fe459563c2d1588740dbea7851917b789f49432fb
166 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a high-severity heuristic flagging a link to an algorithmically-generated URL on disposable hosting, indicative of a link farm used for malicious purposes. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the overall structure and URL patterns point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not 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.
  • 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://leonvi.ru/wix?keyword=themes+in+catcher+in+the+rye+with+quotes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413109/normal_5fd3a57ca8c03.pdfIn PDF document text
    • http://pararapameso.getenjoyment.net/colored_pencil_drawing_techniques.pdfIn PDF document text
    • http://koxoteripuxafo.iblogger.org/what_are_the_3_types_of_heat_transfer_what_is_an_example_of_each.pdfIn PDF document text
    • http://theplafond.xyz/necchi_supernova_julia_534_beltm78f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403121/normal_5fed823e3dbe8.pdfIn PDF document text
    • http://bitjoms.xyz/what_is_the_sky_remote_code_for_a_lg_tvyzr4q.pdfIn PDF document text
    • http://zufikolukak.22web.org/mojuzaxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423429/normal_604cecce157f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410416/normal_602147e731e17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466379/normal_5fdb1a539c6c3.pdfIn PDF document text
    • http://tihefers.online/my_talking_angela_free_mobile_gamessxajt.pdfIn PDF document text
    • http://sebaxupakokak.22web.org/chuyn_t_file_nh_sang.pdfIn PDF document text
    • http://onenature.space/fokajopewixokotolefivarurvzoge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wisunabowogus.epizy.com/alimentos_transgenicos_ensayo.pdfIn PDF document text
    • http://bigapenegig.atwebpages.com/81239693547.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/19877126511.pdfIn PDF document text
    • http://zulifozomitolos.rf.gd/making_ions_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/nigerian_worship_songs_list.pdfIn PDF document text
    • https://s3.amazonaws.com/ladojenefe/sonic_menu_2020_prices.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/indesign_tri_fold_brochure_templates.pdfIn PDF document text
    • http://sumoguvovubipil.epizy.com/schengen_visa_form_switzerland.pdfIn PDF document text
    • http://zepedijuva.epizy.com/basara_heroes_2_ppsspp_apk.pdfIn PDF document text
    • http://suzimisefodude.epizy.com/is_there_going_to_be_a_remake_of_the_shining.pdfIn PDF document text
    • http://rekolesiri.rf.gd/90849020443.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_off0000f675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 5276 bytes
SHA-256: 1f8c9dfae73fd2d92d97168613fadc8b5f97bc31777475fcfa1416d70e04ce37
font_01_sfnt_off00010852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10852 11116 bytes
SHA-256: 53c28fee97e76b0714a3e11877ed44cdbdd4928dcd308ed2251cd853134bf5d2