Malicious PDF — malware analysis report

Static analysis result for SHA-256 02aa7ec89c55462b…

MALICIOUS

PDF

92.2 KB Created: 2021-03-24 20:06:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 5a5e875866ed7eb70ab392e40f544a18 SHA-1: 7c30c7eaa3e7cfee7a479e30579b63e202c6696a SHA-256: 02aa7ec89c55462b3c3e600160f408dd4a6ea37246d4fb2708d2cc2f5d6d2154
194 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with critical heuristics indicating it functions as a link farm. It contains numerous external links, many hosted on disposable domains, suggesting an attempt to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains text related to 'Aptitude formulas for gate pdf', likely a lure to disguise the malicious intent of distributing links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xajibur.ru/award?keyword=aptitude+formulas+for+gate+pdf PDF link annotation
    • https://budigalaxob.weebly.com/uploads/1/3/5/3/135313384/vakiluzegisot_xularu.pdfIn PDF document text
    • https://muxasikij.weebly.com/uploads/1/3/1/8/131872285/xuduxuzegowura-mapuride.pdfIn PDF document text
    • https://fuvekusegubo.weebly.com/uploads/1/3/4/7/134736786/rafesugozubig_roripafonuvuv_mafipetonemo_ravevun.pdfIn PDF document text
    • https://ginegumogigoxi.weebly.com/uploads/1/3/2/8/132816185/5155919.pdfIn PDF document text
    • https://ruvesupiranaduk.weebly.com/uploads/1/3/5/3/135314660/9661673.pdfIn PDF document text
    • http://xofebuledat.scienceontheweb.net/soxafesepetakofa.pdfIn PDF document text
    • http://wegoluxetas.scienceontheweb.net/saps_accident_report_form.pdfIn PDF document text
    • https://depumubawaminuk.weebly.com/uploads/1/3/4/2/134236244/ff2d106399cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485149/normal_5fd348a53a00f.pdfIn PDF document text
    • http://kegetisa.mygamesonline.org/gilisexavi.pdfIn PDF document text
    • https://zowajapizuxazo.weebly.com/uploads/1/3/0/9/130969341/vipofikipajudakokipo.pdfIn PDF document text
    • http://tozepimituxagus.iblogger.org/xunevunudanujudi.pdfIn PDF document text
    • https://lunogowome.weebly.com/uploads/1/3/4/8/134859941/378035.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443610/normal_5fdcba8831f0b.pdfIn PDF document text
    • https://fokutape.weebly.com/uploads/1/3/2/8/132814024/d05f249.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://gazonenewotife.epizy.com/dormirse_conjugation_yo_form.pdfIn PDF document text
    • http://zelibigevuloxuj.epizy.com/wabimom.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/topology_maths_book.pdfIn PDF document text
    • https://s3.amazonaws.com/dikobepibelun/prueba_de_comprension_y_analisis_la_vida_de_lazarillo_de_tormes_tratado_3.pdfIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/stationary_bike_weight_loss_success_stories.pdfIn PDF document text
    • http://zevusup.atwebpages.com/babson_college_campus_map.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/tezaretibejute.pdfIn PDF document text
    • http://futakanawus.onlinewebshop.net/solid_state_chemistry_and_its_applications_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/81314431688.pdfIn PDF document text
    • http://vigiwadovu.epizy.com/xudafaxapuvaxuwu.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_off00010421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10421 5124 bytes
SHA-256: 3a9b5ea422dd91252b33a05cf28d3cb3ef3d4b4324d7b6b1cb6a30ce5c4112c7
font_01_sfnt_off00011595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11595 12000 bytes
SHA-256: 687ae5bc5d1a4c7f4c503dfd496de686dd11de857148406399cb315292de2399
font_02_sfnt_off00013ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC1 16340 bytes
SHA-256: 3609f1f031cf1dfe761ff40d87884a079f7043089ed571a81ebf89aa1678bfd9
font_03_sfnt_off000154a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154A3 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378