Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a0b3ac48dc4d0a6…

MALICIOUS

PDF

95.1 KB Created: 2021-03-22 18:43:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9268de1148803ffff8e3a9462f5d059f SHA-1: d310dc135ac0461fb8e7afef6d418d702782483f SHA-256: 4a0b3ac48dc4d0a6020a597994ce912b36cb16f85ca63ba54e205bc178fd595a
184 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a PDF redirector to known malicious infrastructure. The embedded URL `https://dafemum.ru/wix?keyword=7+day+notice+to+pay+or+quit+nevada+pdf` strongly suggests a phishing or malware distribution lure, masquerading as a legal notice. While no scripts were explicitly extracted, the PDF structure and the presence of numerous links indicate an attempt to direct the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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://dafemum.ru/wix?keyword=7+day+notice+to+pay+or+quit+nevada+pdf In PDF document text
    • https://cdn.sqhk.co/tokofape/jiezAjd/xetisezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368237/normal_6041dca2479c6.pdfIn PDF document text
    • https://cdn.sqhk.co/doginifa/ceiiFhj/kenakizuwopubas.pdfIn PDF document text
    • https://cdn.sqhk.co/vilitemeru/hcHicfF/download_audistar_mobile_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/wosepimi/uThijhj/juredejukawusulesi.pdfIn PDF document text
    • https://cdn.sqhk.co/rixutixim/Jjhgdgj/90139066991.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426418/normal_60063a0760337.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/hicgev8/drawing_grid_maker_for_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376609/normal_6048a4c1ec17b.pdfIn PDF document text
    • http://pejojatodaja.iblogger.org/solve_and_graph_inequalities_worksheet_7th_grade.pdfIn PDF document text
    • http://lusejifunod.22web.org/bsb_video_songs_free.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvapolaxaj/idvAYjf/ninja_arashi_2_download_apkpure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449421/normal_604e6c0cc05f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404290/normal_5fe5e5e5035a2.pdfIn PDF document text
    • https://cdn.sqhk.co/nemovofa/hwVkheT/jozeg.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwuwigo/Ol6qhaw/13505227647.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/geradi/65653278624.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/autocad_file_to_online_converter.pdfIn PDF document text
    • http://lizuratudesaxop.epizy.com/selenium_webdriver_java_interview_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/aa_meetings_in_west_ocean_city_md.pdfIn PDF document text
    • http://rereroma.epizy.com/72620564644.pdfIn PDF document text
    • https://s3.amazonaws.com/mekonulegipero/cablevision_flow_apk_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/pezarenizi.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_off000134be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BE 5212 bytes
SHA-256: 4bdaa2ffdd528f80165bbb35ab34cd9372a4ed4e41b9275a4753d12e4d7b9d9d
font_01_sfnt_off0001469a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1469A 11256 bytes
SHA-256: 6382d71a8c8e34a61ece0a3da1dee77794dc182542db4fbf49d966df1233e3fd