Malicious PDF — malware analysis report

Static analysis result for SHA-256 fce445ad69389412…

MALICIOUS

PDF

93.2 KB Created: 2021-04-06 16:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: e66ed5440ae9a0374b3c7efd27d1984d SHA-1: fa459dbe705c06e3a01a776a11df31c284f001ca SHA-256: fce445ad69389412afba1f607b1f03c6ff2822fff7a81a2e37a6babad3f00926
184 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical finding for redirecting to known malicious infrastructure. The ML classifier also assigned a high probability of maliciousness. The document body contains garbled text, suggesting it is not intended for direct user consumption but rather to host embedded links. The primary malicious activity observed is the redirection to external URLs, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=formas+de+comunicacion+linguistica+ejemplos In PDF document text
    • https://cdn-cms.f-static.net/uploads/4405907/normal_5fd6529e9395d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375194/normal_60226f21c4806.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484633/normal_5ff2d8a12dd9a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411921/normal_601b28445310b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488141/normal_6040a0ea59b6b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410727/normal_5ff4eafec22f1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368230/normal_5fddc0e2d11aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489428/normal_602d3ee5151a6.pdfIn PDF document text
    • http://gejulavofanutar.mygamesonline.org/archangel_s_war_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377933/normal_5fceb53a0b424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418579/normal_6035e96359f51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369506/normal_60126b4174905.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490367/normal_60594701a336a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446283/normal_601f4032b3791.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365620/normal_60001163865e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384307/normal_601dfd223272f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484365/normal_5fd6463b031fd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vegunag.rf.gd/44351844728.pdfIn PDF document text
    • http://wiresudakijiwa.rf.gd/levug.pdfIn PDF document text
    • http://sujunagew.epizy.com/chlamydia_2020.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/72827705884.pdfIn PDF document text
    • http://zezazemana.epizy.com/most_dangerous_game_definitions_matching_worksheet_answers.pdfIn PDF document text
    • http://bujisovi.epizy.com/church_administration_software_free.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_off000106fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FA 5424 bytes
SHA-256: 8345d6f276c1a43fc7abcfbd8bf81d7836ccc24015a40edcaeb410705a21612e
font_01_sfnt_off00011954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11954 2128 bytes
SHA-256: 1ea4860bc88257baff5d1930ac9d8a051b4b98771fba32c12466e3c981d4083b
font_02_sfnt_off0001228c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228C 13264 bytes
SHA-256: 29bc9c1f95991512c2517c4dd3ff680b7513a744d70e6a350cd2ac4936e92454
font_03_sfnt_off00014d1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D1F 16840 bytes
SHA-256: 82c62f8765a7361abae78fe01acd008149ee390b0b7ffbb80efee0ee33bf3cd9

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