Malicious PDF — malware analysis report

Static analysis result for SHA-256 4257f831421f189b…

MALICIOUS

PDF

88.6 KB Created: 2021-03-30 19:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f6b7289f777666b175f90e74e3b3231c SHA-1: c837bbb2222df566342864986a6160009b7a041b SHA-256: 4257f831421f189b01f72903b27841c82ac175f48f636f05f45af1a17c32d2c0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains an embedded URI pointing to 'jottigo.ru', which is likely a phishing or malware distribution site. The document body, though heavily obfuscated, contains text related to downloading an 'apk terbaru', suggesting a lure for users to download potentially malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9904

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://jottigo.ru/wix?keyword=download+pou+apk+terbaru PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478685/normal_5fdbd82fe1a94.pdfIn PDF document text
    • http://lumogodasekepi.mypressonline.com/57995713182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382621/normal_5fdc3322f2a14.pdfIn PDF document text
    • http://riwozizedilar.mygamesonline.org/ap_set_question_paper_2020.pdfIn PDF document text
    • http://zuzatew.medianewsonline.com/more_than_words_tab_songsterr.pdfIn PDF document text
    • http://rulabepotinujeb.mypressonline.com/how_to_update_a_hs_mini_maxx.pdfIn PDF document text
    • http://degifutuv.scienceontheweb.net/nusopikojaguxekevuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459324/normal_5fd6787681fce.pdfIn PDF document text
    • http://gomigapujasep.sportsontheweb.net/circulatory_shock_nejm.pdfIn PDF document text
    • http://tezatigobupuvu.22web.org/labor_market_information_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450870/normal_601fac0acdc44.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426945/normal_6021d44ec0702.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_6782822095e94bf6aeb740e7797a4516.pdf?index=trueIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_bee76da619fd456eab4872c4403d3f73.pdf?index=trueIn PDF document text
    • http://disofebuwugojuj.epizy.com/mosutedosolowuwipov.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/thule_roof_rack_parts_near_me.pdfIn PDF document text
    • http://makakanow.onlinewebshop.net/45096557569.pdfIn PDF document text
    • http://rorazizaxaf.atwebpages.com/29830064173.pdfIn PDF document text
    • http://safilizejodi.epizy.com/what_is_box_12b_dd_on_your_w2.pdfIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_e050ea28389e4023a5ca8fd5f0a7bf53.pdf?index=trueIn PDF document text
    • http://jimarol.myartsonline.com/86760087237.pdfIn PDF document text
    • https://9177b9cb-4c70-42bd-a9e0-27a1bf53b67b.filesusr.com/ugd/9baf76_6d51439be52e41c7b0ff043592c75f24.pdf?index=trueIn PDF document text
    • http://foletakusuwavid.rf.gd/midi_to_usb_cable_sweetwater.pdfIn PDF document text
    • http://xuwajapu.rf.gd/printable_aphasia_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/rogugagatuf/black_white_and_gray_colors_answers._com.pdfIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/6229974900.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBE 2880 bytes
SHA-256: 619a44e8b5c2a2d3fc0e18259d8022938ad4f8b30552901bc68dc41c3d0f2ef0
font_01_sfnt_off000106fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FC 5072 bytes
SHA-256: de057d6aa6a8b053091139d83c7e4f128a425e877e74e703c72a7417ec4f9d74
font_02_sfnt_off00011863.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11863 11152 bytes
SHA-256: 249d22cb8a301b4036b0b20628facd191d4019cc60fcec8d49eec4ffaad0de85
font_03_sfnt_off00013edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EDD 16076 bytes
SHA-256: 1882111c93182885355c326966aa8b929451d516289c4c69bffbc3e8f6f639a9