Malicious PDF — malware analysis report

Static analysis result for SHA-256 e31775ab68bc6420…

MALICIOUS

PDF

71.1 KB Created: 2021-03-07 10:48:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ca0c65621fb2ec7904fee1e1fba559ae SHA-1: 9b6f6d973f88e9036ec0d3042ed056dba98a76ad SHA-256: e31775ab68bc6420a9eb929b52bfaf443f30243f85a1b0aafac99b48176b0ecb
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/award?keyword=asrock+z170+pro4s+price PDF link annotation
    • https://xivimuwujaka.weebly.com/uploads/1/3/4/4/134440816/nidekapotixe.pdfIn PDF document text
    • https://gufulesem.weebly.com/uploads/1/3/4/6/134698375/fomezulowatemud.pdfIn PDF document text
    • https://fozogefijegajor.weebly.com/uploads/1/3/1/4/131453134/4fe57958d89.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/if8geYL/basketball_goal_walmart_toddler.pdfIn PDF document text
    • https://cdn.sqhk.co/worekoxe/0hbibgc/music_player_app_free_download_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/panufarubel/gdQfTqs/likert_scale_6_options.pdfIn PDF document text
    • http://detolenikalopaj.iblogger.org/analise_combinatoria_concurso.pdfIn PDF document text
    • https://kawuzuvom.weebly.com/uploads/1/3/1/3/131379118/dapasevodu.pdfIn PDF document text
    • https://bipejazikapidim.weebly.com/uploads/1/3/4/5/134529651/d58211.pdfIn PDF document text
    • http://kokilubowo.22web.org/arcgis_image_server_10._5_installation_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/towinomer/eieVw3G/daxugozofedapapazofa.pdfIn PDF document text
    • https://gegoviboz.weebly.com/uploads/1/3/4/8/134876631/7571473.pdfIn PDF document text
    • https://cdn.sqhk.co/tirekidifole/ghjBii2/nukosupunak.pdfIn PDF document text
    • https://kagunalikabogow.weebly.com/uploads/1/3/5/3/135350350/06d7a4668.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/gfjijgk/sky_force_2014_card_24.pdfIn PDF document text
    • https://cdn.sqhk.co/zebenane/uXgjj1d/red_roses_meaning_lil_skies.pdfIn PDF document text
    • https://cdn.sqhk.co/xawemubimaj/heXhiy5/sonafexoliwipukisiguxos.pdfIn PDF document text
    • https://logosomuzabi.weebly.com/uploads/1/3/0/9/130969340/7460243.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xasitotimokines.rf.gd/formula_para_calcular_el_volumen_y_area_de_un_cilindro.pdfIn PDF document text
    • http://miloritamuve.rf.gd/69467886881.pdfIn PDF document text
    • http://tutegijuvejok.epizy.com/how_to_install_graco_snugride_35_base.pdfIn PDF document text
    • http://dafudezukixoz.epizy.com/caldera_forms_support.pdfIn PDF document text
    • http://bozolukiket.epizy.com/clash_of_clans_guide.pdfIn PDF document text
    • http://wuluveviwibe.epizy.com/14662733246.pdfIn PDF document text
    • http://bagibuboje.rf.gd/59427492690.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_off0000dac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC6 5152 bytes
SHA-256: b549d3b167943b14927c3e28cc75a78302d369e67e2c23598d29b2799f61513b
font_01_sfnt_off0000ec7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 10128 bytes
SHA-256: 15282adc0eb1e0dde5b7f973943df166a66f0fc330f72f5e58b1e2ef0c40eb87