Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e9b24deff52d6a5…

MALICIOUS

PDF

138.0 KB Created: 2021-03-02 21:00:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 11279faaf9be45450f792eaf87e1d834 SHA-1: 24444a358cdee7695902401cda0379eac907d19c SHA-256: 8e9b24deff52d6a54cf559550db0afa5a71657a58a805da77f41d9a12da20af4
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to be a lure related to a common search query, intended to drive traffic to these external links. No scripts were extracted, but the presence of numerous URLs points to a phishing or ad-revenue generation scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://midufefew.ru/strik?utm_term=how+do+i+stop+my+adt+alarm+from+beeping+when+i+open+the+door PDF link annotation
    • https://tusezewepoxir.weebly.com/uploads/1/3/4/3/134339989/5515858.pdfIn PDF document text
    • http://hotita.fun/sfv_patch_noteswnzvx.pdfIn PDF document text
    • https://cdn.sqhk.co/situdejoj/zIgjyig/bejuxe.pdfIn PDF document text
    • https://wisejagu.weebly.com/uploads/1/3/4/8/134881465/gasobigimisu-kofuwemuje.pdfIn PDF document text
    • http://masotudulajipi.22web.org/dinaderaxenekexelotefe.pdfIn PDF document text
    • https://kukurako.weebly.com/uploads/1/3/5/3/135321284/d66abb1d4b03f.pdfIn PDF document text
    • http://bitcoinov.site/honeywell_oscillating_tower_fan_instructionstx9ue.pdfIn PDF document text
    • https://butevexonukuzi.weebly.com/uploads/1/3/2/6/132681970/9997238.pdfIn PDF document text
    • http://tuxiwos.iblogger.org/suwadiwamusexabaj.pdfIn PDF document text
    • https://kowenijog.weebly.com/uploads/1/3/4/0/134096242/43283295dcac2.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/ifygghi/51213346046.pdfIn PDF document text
    • https://dakufosaxem.weebly.com/uploads/1/3/4/7/134771611/pirijokurepij.pdfIn PDF document text
    • http://ottics.ru/piriformis_syndrome_stretches_and_exercises87xx4.pdfIn PDF document text
    • https://rejileju.weebly.com/uploads/1/3/4/3/134335231/dusus_vipujizaxalewe_lituzadon_tutuvujuwo.pdfIn PDF document text
    • http://verifedform.com/stealth_cam_not_working_after_update0j3da.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/gjcxPib/4x4_offroad_jeep_mountain_hill_game_download.pdfIn PDF document text
    • http://savagolisax.22web.org/programa_para_unir_i_love.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tituroxir.rf.gd/4457442524.pdfIn PDF document text
    • http://pumumiz.epizy.com/finokemoda.pdfIn PDF document text
    • http://bevetobepo.rf.gd/air_force_academy_acceptance_rate_2019.pdfIn PDF document text
    • http://bexadujozopu.epizy.com/mamujesegitolarelutugijas.pdfIn PDF document text
    • http://zufodokiden.epizy.com/xunisuveset.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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D220 5748 bytes
SHA-256: 50923d050e7cc414a209b89f7e79d1b30aceabdd6830d8b85ec968bbacc4d348
font_01_sfnt_off0001e596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E596 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0001f0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F0F9 11736 bytes
SHA-256: 7528ca0819b9f4820692bbab35219baf796be3b5cf7d480dfa098e459dd31154