Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bbfad5629b3fa85…

MALICIOUS

PDF

90.2 KB Created: 2021-03-19 12:35:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b8eaa8b8b85ee7d3efaa401af6d32b19 SHA-1: bee1b4665c6f9d3df7a05ccdf87012fe97500858 SHA-256: 7bbfad5629b3fa85a78fbc8c31d1efa2bd93785676cdaa29e647e1294d2d4375
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'acrostic poem template google docs'. The presence of numerous external URIs, including one pointing to 'crophysi.ru', strongly suggests the document is designed to redirect users to a malicious site, likely for phishing or to download a secondary payload. No scripts were extracted, but the overall structure and URL findings point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://crophysi.ru/123?utm_term=acrostic+poem+template+google+docs PDF link annotation
    • http://serdyukov.pro/974436344492om75.pdfIn PDF document text
    • http://polfact.site/polycom_soundstation_2_power_adapter1pu4i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488809/normal_60542217d2a7e.pdfIn PDF document text
    • https://cdn.sqhk.co/dovawowo/djjluij/finejeguxutevisumeja.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/achyutam_keshavam_krishna_damodaram_female_song_downloadh7set.pdfIn PDF document text
    • http://kpupnov.pro/2331362950823nlz.pdfIn PDF document text
    • http://apsdd54gfv.xyz/707389708143zbvm.pdfIn PDF document text
    • https://cdn.sqhk.co/nijazulagoza/ggShjij/zavenemagivakejereji.pdfIn PDF document text
    • http://lianhua.life/dilapidation_report_cost_melbournexqz6m.pdfIn PDF document text
    • http://zanartcc.net/72952737478sowqd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384307/normal_6005ba9c2a3a5.pdfIn PDF document text
    • https://cdn.sqhk.co/fololekumi/jijcii5/sulepideterepakozagewine.pdfIn PDF document text
    • https://cdn.sqhk.co/fematixub/Qibgghf/magic_sing_karaoke_system.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/gjc2gcD/13315449032.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/bSWijgj/redupanedolobugil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481540/normal_6040a2f2bf8ad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365649/normal_5ff1cc1f455ba.pdfIn PDF document text
    • http://ita-talia.fun/comentario_de_texto_cartas_marruecas_liiilnzx6.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/ejemplos_de_ecuaciones_de_primer_grado_con_parentesis_resueltasspwv3.pdfIn PDF document text
    • https://cdn.sqhk.co/xalesikozip/jejbkij/busemun.pdfIn PDF document text
    • http://pressit.fun/pemopasa1smgs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c65d2b9e-93c6-4068-b483-dd85a3b9f0bf/42529150860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e1f0e52-12a7-4b2e-817f-98c5458456de/microscope_mania_quiz_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/803d70a0-aac7-4a3e-bc9d-ca9411c0195d/expository_essay_topics_grade_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ee00195-9185-40fc-915a-82e7200fde01/jevadumap.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_off00010051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10051 5380 bytes
SHA-256: a966cce5ed9edb2751f36776732b772f2304320639ca5bc471070ab905698a08
font_01_sfnt_off0001127e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127E 1936 bytes
SHA-256: 246569b5fd7226bd0ebf3c016de7ba0bf82e996896d660a08030b2af0a08efd3
font_02_sfnt_off00011bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBF 11728 bytes
SHA-256: 80ba30e8e4f6bfe47fc0ebe4a365465021d5fd02ec2492323f22fc27a9f081e6
font_03_sfnt_off000142e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E7 16372 bytes
SHA-256: bf6ff1fecdab7ac09e21e59f1314de822cd9313089f6c2808d0d5f8c48b6d5f7

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