Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb96f2241cd1442…

MALICIOUS

PDF

84.1 KB Created: 2021-03-22 23:00:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 96e3ea63a465e8c3e7b012607c24431d SHA-1: 31813d9829339fafac980926a800b032dff85398 SHA-256: 3bb96f2241cd144278e4bf61298ddbc1a0bc4b34d117cce5010b2560a32badc6
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though truncated and partially obfuscated, contains keywords related to 'neumonia atipica' and 'pdf', suggesting a lure. Numerous embedded URLs point to disposable domains, many of which are identified as link farms, indicating a phishing or scam attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lozipotod.ru/award?keyword=neumonia+atipica+definicion+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450439/normal_5fea1ad4e613c.pdfIn PDF document text
    • http://nitiwomifigurod.mygamesonline.org/libro_arqueologia_del_saber.pdfIn PDF document text
    • http://bestpriceforukraine.xyz/83342657945twurm.pdfIn PDF document text
    • https://rajepejejema.weebly.com/uploads/1/3/4/8/134860913/vomanezelunidusuli.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469836/normal_5ffe52622ebc2.pdfIn PDF document text
    • http://test123test.xyz/89586102563kif33.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/76476804594.pdfIn PDF document text
    • http://vvinorama.website/xofevapofidemosaliloguzug913sw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419413/normal_6014023d44d26.pdfIn PDF document text
    • http://gedadekenoz.mywebcommunity.org/what_is_the_calorie_deficit_needed_to_lose_weight.pdfIn PDF document text
    • https://jupuwova.weebly.com/uploads/1/3/1/4/131409597/romumew_xobozosor.pdfIn PDF document text
    • http://zekojotewakugag.mypressonline.com/formula_to_calculate_gdp_per_capita_growth_rate.pdfIn PDF document text
    • http://tujijamutibe.sportsontheweb.net/faripoladomegememawoveju.pdfIn PDF document text
    • https://moxusovilala.weebly.com/uploads/1/3/0/7/130738705/2999597.pdfIn PDF document text
    • http://vofufime.mypressonline.com/3dplm_aptitude_questions_and_answers.pdfIn PDF document text
    • http://nafepuzemobir.sportsontheweb.net/benim_hocam_tarih_konu_anlatm_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408460/normal_6029648a13f88.pdfIn PDF document text
    • https://musevurimimurom.weebly.com/uploads/1/3/4/7/134711136/vemazipiluwutulidus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vorawaforase.epizy.com/lolijesewunabetegilege.pdfIn PDF document text
    • http://rojegasofibi.epizy.com/bibesapomeziw.pdfIn PDF document text
    • http://vanuzavabew.epizy.com/towediwekudoxavafabugu.pdfIn PDF document text
    • http://jasunusemoki.onlinewebshop.net/back_titration_to_determine_ammonium_ion_lab_report.pdfIn PDF document text
    • http://pegafiloxor.epizy.com/sample_short_biography_template.pdfIn PDF document text
    • http://folujas.epizy.com/juvepokinoxoxonijosugan.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 4964 bytes
SHA-256: d98dcf2f508496b989245d057399808b17c70c0f857d5d563bab2d358ad43b62
font_01_sfnt_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 12620 bytes
SHA-256: 10e4b8d604ff32b6402e0dce849d14d62213289ac94ed26b6b3d09bd51717409
font_02_sfnt_off00012bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDD 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953