Malicious PDF — malware analysis report

Static analysis result for SHA-256 145b9a6354976867…

MALICIOUS

PDF

122.6 KB Created: 2021-03-18 11:34:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c88f3ca0366fa6020b5416e835bbbc85 SHA-1: 6944a3e2c0fa8e16c7e4842ab4df8c59a78175c1 SHA-256: 145b9a63549768672f26afa6d6094cc0457c778060b711ac5128b034b3e54d8b
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm or redirection mechanism. The PDF structure and embedded content, while heavily obfuscated, are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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=2+nephi+1+21 PDF link annotation
    • https://cdn.sqhk.co/jisaside/hrzy4gi/smashy_road_most_wanted_world_record.pdfIn PDF document text
    • https://cdn.sqhk.co/gabebutiz/8gMkDhe/fobifabokajevinoze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413110/normal_5fec011401a6a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408586/normal_602841485921c.pdfIn PDF document text
    • http://zajiledafalam.getenjoyment.net/jejajirawodusiwogerel.pdfIn PDF document text
    • https://tesegape.weebly.com/uploads/1/3/5/3/135387632/dojumoz_vufepis_sejigomuvitew_jawagegozub.pdfIn PDF document text
    • https://vejotawugupexo.weebly.com/uploads/1/3/4/7/134756202/vuzididusikoxede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368975/normal_603e1a514acaf.pdfIn PDF document text
    • http://zeruxejobimal.mywebcommunity.org/jekikaf.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/ZiK47e9/bus_driving_simulator_pc_game_download.pdfIn PDF document text
    • https://funebaxap.weebly.com/uploads/1/3/4/3/134399245/rawazole.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393353/normal_5ff01ec7ce133.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403818/normal_5fc72c60ced00.pdfIn PDF document text
    • http://jolixasij.sportsontheweb.net/vusefosokomudiwumetepodof.pdfIn PDF document text
    • https://vupagivoro.weebly.com/uploads/1/3/4/3/134314863/00e300b44355.pdfIn PDF document text
    • http://kebukodakaver.iblogger.org/alimentos_transgenicos_en_el_peru.pdfIn PDF document text
    • https://cdn.sqhk.co/javukapegami/gCgijjG/34759206181.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_a9686c33e8b94c5893ed78e475507ffc.pdf?index=trueIn PDF document text
    • https://91506351-5699-48ce-85e7-8e7d071f4e87.filesusr.com/ugd/d775a9_4bc4e6335b3847f9846e03de08e7840f.pdf?index=trueIn PDF document text
    • http://rorulapuvutoj.epizy.com/how_to_use_the_foodsaver_vacuum_sealing_system.pdfIn PDF document text
    • http://reguturutomasut.rf.gd/folim.pdfIn PDF document text
    • https://7b9449e5-51e9-4a7e-81f5-8587c42320f9.filesusr.com/ugd/571bad_e64725bbc4e541c685a6819393702b61.pdf?index=trueIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_76acd910836e4ed68cd593f1e143cb36.pdf?index=trueIn 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_off0001a92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A92D 4480 bytes
SHA-256: d958eff2426a9a1f1a9564cca5139568778743ea3c009375fa0446e4a560f895
font_01_sfnt_off0001b873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B873 10736 bytes
SHA-256: 8d4c325fe8b6375c784714a363be080b7eb7f17dde7fc0dffd03ad5aa168dc55