Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8f7878daea0a69b…

MALICIOUS

PDF

68.3 KB Created: 2021-02-06 08:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: aec61a099b6b5bfe17638dc2f00a3a5f SHA-1: 5e4c6c6fcba23676ab7a28d59e75c015a6cdce3a SHA-256: d8f7878daea0a69b616e9d171440c5ea506f9c2b8ebb6742f2a35f653ef7cafd
184 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical alert for linking to known malicious redirector infrastructure. The embedded links, disguised with search-like terms, point to numerous disposable domains, indicating a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's designed to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/123?utm_term=graduated+cylinder+sizes+for+sale In PDF document text
    • http://useporte.xyz/verathon_bladderscan_prime_plus_service_manualhyti9.pdfIn PDF document text
    • http://wojifos.22web.org/school_uniforms_should_be_mandatory_debate.pdfIn PDF document text
    • http://leftoutclub.com/arne_jacobsen_station_alarm_clock_manualm1xeg.pdfIn PDF document text
    • http://braco.ru/96733394265srrwq.pdfIn PDF document text
    • http://bozabanafuz.22web.org/1494321981.pdfIn PDF document text
    • http://biolinkus.me/92377147659t33u0.pdfIn PDF document text
    • http://halfraire.xyz/hotel_transylvania_3_virtual_reality_activity_app_freetwiq5.pdfIn PDF document text
    • http://kaxidabifibag.iblogger.org/film_big_hero_6_2017.pdfIn PDF document text
    • http://vobigabifinu.22web.org/firanofelex.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fedojigudaj/63008870231.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/83936666916.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/80672859765.pdfIn PDF document text
    • http://vitupofelomar.epizy.com/tubemate_cracked_apk.pdfIn PDF document text
    • http://gijomifede.rf.gd/h_s_s_c_answer_key_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/legobegutulo/annamalai_movie_songs_starmusiq.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/depegogizatezed.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_off0000cc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1C 5196 bytes
SHA-256: 1b32d7b37f2521e4f3dbe821751bfd261a91ece255415a86a2b552623b2d8f05
font_01_sfnt_off0000dded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDED 10912 bytes
SHA-256: 49551ed3cd00e287f08212230d401e4f3e261760a6d817eaaa8cb99e38c730d6

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