Malicious PDF — malware analysis report

Static analysis result for SHA-256 793b75fdf94c9e09…

MALICIOUS

PDF

77.4 KB Created: 2021-03-23 06:35:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1a40c45aa14ec5252b863e9331cd8ba6 SHA-1: 01e655e2795c1d76e0c5cb5fd1cec6abe22089ba SHA-256: 793b75fdf94c9e0996b96cabef9b4937d31ecc46c1006c4fd46ee974c9b984f2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though partially garbled, suggests a lure related to downloading a physics textbook, which is a common tactic for phishing or malware distribution. The presence of external URIs and a link farm indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/strik?utm_term=principles+of+physics+resnick+halliday+pdf+download PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405437/normal_600a6fdba15c8.pdfIn PDF document text
    • http://polobasopika.mywebcommunity.org/blood_type_b_diet_food_list_to_lose_weight.pdfIn PDF document text
    • http://nakalabaxis.mywebcommunity.org/acidosis_tubular_renal_gpc.pdfIn PDF document text
    • http://gedawuxofawu.iblogger.org/africa_physical_map_hd.pdfIn PDF document text
    • http://bivaxosufuxibo.mygamesonline.org/catia_v5_tutorial_assembly_design.pdfIn PDF document text
    • http://worozoxiw.sportsontheweb.net/12325256192.pdfIn PDF document text
    • http://gamuxiwami.getenjoyment.net/90734534948.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505363/normal_601ff765237fd.pdfIn PDF document text
    • http://paxazesak.iblogger.org/blender_2._8_manual_download.pdfIn PDF document text
    • http://kufejat.sportsontheweb.net/chemistry_past_papers_a_level.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kisagoz/pagadotorir.pdfIn PDF document text
    • http://vuginok.epizy.com/tratamiento_de_anemia_falciforme.pdfIn PDF document text
    • http://bokepomi.onlinewebshop.net/dujotufakapipirisupix.pdfIn PDF document text
    • http://jalovunenenema.epizy.com/anagram_solver_free.pdfIn PDF document text
    • http://pufawalaxovosi.epizy.com/adobe_acrobat_pro_dc_free_trial_mac.pdfIn PDF document text
    • http://roruvavaderej.epizy.com/avital_4x03_remote_start_manual.pdfIn PDF document text
    • http://luzowotobor.rf.gd/30366268034.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/tenatavabibutepukekiwir.pdfIn PDF document text
    • http://poluwusafoge.epizy.com/altova_xmlspy_2018_professional_xml_editor.pdfIn PDF document text
    • http://zepurudevivo.rf.gd/jeravovelesevap.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_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 5504 bytes
SHA-256: efc912d7ce22b264103662ccbbbe712b3e571fdd4b966096ad7e4368ef548f93
font_01_sfnt_off0001012c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012C 10964 bytes
SHA-256: 94ff9d3ebadbf22cdd8a2e14a024a14dd5b13c155d7d210076a814b56c78a751

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