Malicious PDF — malware analysis report

Static analysis result for SHA-256 9573a8f14a4f6164…

MALICIOUS

PDF

80.0 KB Created: 2021-04-27 10:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab82bb27d72a8388a5ca3ad3e6980758 SHA-1: 9d72cab063720456481f36b34d766d8887bea0c6 SHA-256: 9573a8f14a4f6164241f49bef52684a197d1eca0060fe510038e3c44025023e6
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristic detections indicating it is a link farm designed to redirect users to potentially malicious content. The document body, though heavily obfuscated, contains keywords related to appliance repair, suggesting a lure for phishing or scamming. The presence of external URIs and a high ML score further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=kenmore+electric+range+model+790+burner+not+working
    • https://cdn.sqhk.co/zifeduwa/hurghgY/nexisevex.pdf
    • http://nowojamedomi.22web.org/xujanagosukiwofabi.pdf
    • https://cdn-cms.f-static.net/uploads/4472766/normal_6053012587a85.pdf
    • http://nubemeketetu.mypressonline.com/31106056129.pdf
    • https://cdn-cms.f-static.net/uploads/4485580/normal_5fd1e1f2627e8.pdf
    • https://static.s123-cdn-static.com/uploads/4379474/normal_5ff4d17f162d6.pdf
    • https://cdn-cms.f-static.net/uploads/4455639/normal_602a0f59bfa23.pdf
    • http://naturelofo.mypressonline.com/lixifesulud.pdf
    • https://cdn.sqhk.co/mibujatone/jgjajaW/bol_tere_mitte_mitte_video_song.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_68c4ed42d18b47c98bad8630df9787e7.pdf?index=true
    • https://s3.amazonaws.com/mutirexa/cinema_4d_mac_free_full.pdf
    • http://mosararivifu.rf.gd/alternations_solitaire_free.pdf
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_4af0a2dfdbb546b4b46e75f9e1aced86.pdf?index=true
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_45c7f526d7524b52817bcb22a936dbe2.pdf?index=true
    • https://s3.amazonaws.com/loxopudizus/el_color_de_mis_palabras_libro_completo.pdf
    • https://s3.amazonaws.com/kubafezin/has_anybody_ever_died_on_the_show_fear_factor.pdf
    • http://kakavogulogij.onlinewebshop.net/42098032786.pdf
    • https://s3.amazonaws.com/wovitiku/fujixajime.pdf
    • https://s3.amazonaws.com/kawotexulozax/sistema_mexicano_de_alimentos_equivalentes_4a_edicion.pdf
    • https://748e62c5-a849-4dff-87e7-3b5f74cb3522.filesusr.com/ugd/0df896_7783fc20adc5404cb30d1bab316b8cc9.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec71.bin
5073e6608b8be22acde8e19b8aa396f4943cc7fbdf0c6d51d4723553214e2e46
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC71 5608 bytes
font_01_sfnt_off0000ff71.bin
2a6df5b6a5029960807d946ac8bdf6b547a0909524df8dd22465b91329b48dd0
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF71 10788 bytes
font_02_sfnt_off00012415.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12415 4324 bytes