Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a094169d2503e2…

MALICIOUS

PDF

99.9 KB Created: 2021-04-21 16:36:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: c83740188e1c6a59db76863ae6bba97a SHA-1: 15523c295d8ea50145e3db83a21f31eb21d2227c SHA-256: 88a094169d2503e2fbcc8d5ded6bfee6a2ce99d3b4ac15ab03fe5a4b5fbc3fed
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting and another pointing to a potentially malicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were extracted, the presence of suspicious URLs and the heuristic findings suggest the document is designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://druttle.ru/strik?utm_term=what+are+the+three+main+objectives+of+first+aid PDF link annotation
    • http://pofaduxiruk.getenjoyment.net/13778419144.pdfIn PDF document text
    • http://jakiduve.scienceontheweb.net/bodukege.pdfIn PDF document text
    • http://wozasewu.22web.org/90571591529.pdfIn PDF document text
    • http://zukirudon.mypressonline.com/wendy_frosty_recipe_dairy_free.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/cd4051_datasheet.pdfIn PDF document text
    • http://sujimelowakolop.medianewsonline.com/dunofikuvugifugogukojexam.pdfIn PDF document text
    • http://woziwowariv.sportsontheweb.net/jurnal_cacing_tanah.pdfIn PDF document text
    • http://naturelofo.mypressonline.com/rokugaduxi.pdfIn PDF document text
    • http://lejunuzegakikuv.mypressonline.com/knee_pain_rehab.pdfIn PDF document text
    • http://kogemamumudun.22web.org/large_bowel_obstruction_radiology.pdfIn PDF document text
    • http://terugate.mypressonline.com/articulaciones_cartilaginosas.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
    • https://uploads.strikinglycdn.com/files/696b654a-8425-422d-a3fc-de8a28a1e193/royal_mail_international_letter_rates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53152300-bd9d-4a1d-9504-d035134cd043/44594505508.pdfIn PDF document text
    • http://mabagojovas.epizy.com/90853955106.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/454c1d28-c8fd-4050-8948-c1f95da4b31a/new_holland_ls180_weight.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/lezijulosofoloxivodeje.pdfIn PDF document text
    • http://zisukuvi.atwebpages.com/chain_rule_quiz.pdfIn PDF document text
    • http://nitubak.atwebpages.com/ankle_dorsiflexion_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/fazipudawiteg.pdfIn PDF document text
    • http://fuluxewamotate.atwebpages.com/baby_girl_names_starting_with_s_marathi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/667c69d0-e3ef-4167-9620-ebd62b369cd1/barriers_to_effective_communication_definition_and_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af52b37-673f-4c72-9d3d-59968838dfc2/what_are_the_main_differences_between_judaism_christianity_and_islam.pdfIn PDF document text
    • http://josuxak.atwebpages.com/3051564350.pdfIn PDF document text
    • http://votaveliratelom.epizy.com/fiba_official_basketball_rules_2020.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A22 5304 bytes
SHA-256: c92ebda035766c4366fcc120d8bac77db668fa474887c2abc80c2af729d84a2c
font_01_sfnt_off00014c18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C18 11624 bytes
SHA-256: 6891035b6c69c2402edb6138965a39835fdaa0baf2f10659c1d71f8b603c445f
font_02_sfnt_off00017364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17364 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e