Malicious PDF — malware analysis report

Static analysis result for SHA-256 b079b08304332fe9…

MALICIOUS

PDF

86.3 KB Created: 2021-03-28 11:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b76796c885b2646afa067949d4b4ca0a SHA-1: 57651399f2648da2f28874ba00e90f5c7c758ba7 SHA-256: b079b08304332fe9709f55e0514b2adfa833964f290353fd42aee8ea4f7be36e
134 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external URIs, many hosted on disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. While no scripts were extracted, the presence of external links and the heuristic 'SE_DOWNLOAD_BUTTON' suggest a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/123?utm_term=adobe+indesign+proposal+templates PDF link annotation
    • https://fexedewikefitug.weebly.com/uploads/1/3/2/6/132681233/56c8191502445f2.pdfIn PDF document text
    • http://getakabawi.22web.org/wills_eye_institute_marlton_nj.pdfIn PDF document text
    • https://zemaxixose.weebly.com/uploads/1/3/4/6/134636511/xajitifafopuv.pdfIn PDF document text
    • http://matodobotosirom.66ghz.com/zuziwezajazonesibubeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480884/normal_601daf999ce34.pdfIn PDF document text
    • http://jetelijunejuk.iblogger.org/equivalent_fractions_worksheet_year_2.pdfIn PDF document text
    • https://kitedagipan.weebly.com/uploads/1/3/4/8/134892955/puluze_piwolo.pdfIn PDF document text
    • http://pevojatinolotej.22web.org/tratamiento_asma_pediatria.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369796/normal_60444b1cb05b4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nisuzadusidu.epizy.com/jizizobozak.pdfIn PDF document text
    • https://s3.amazonaws.com/zumomasugipeno/marketing_plan_template_docx.pdfIn PDF document text
    • https://s3.amazonaws.com/xomepixo/cal_spa_swim_spa_commander.pdfIn PDF document text
    • http://vukirulavobos.epizy.com/8038555753.pdfIn PDF document text
    • https://cf075d60-af7c-4c71-a16c-5c8c125a9bb7.filesusr.com/ugd/cc03df_383d600dbeb646c0961537572db9c519.pdf?index=trueIn PDF document text
    • http://gerubetez.rf.gd/how_many_satellites_does_dish_have.pdfIn PDF document text
    • https://s3.amazonaws.com/kiguteperilodu/ruleluxemodupex.pdfIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_40b88f0ad6bf4300a2a639137c77d984.pdf?index=trueIn PDF document text
    • http://bekonoxidolu.rf.gd/45516123730.pdfIn PDF document text
    • http://tixerewolulas.rf.gd/itemised_quote_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/7830825242.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_off0001157c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157C 5408 bytes
SHA-256: a47e84293f26f04a2edd9b2c8a78dc77c2736d882868a708785f2c084b8ed13f
font_01_sfnt_off000127c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127C1 10680 bytes
SHA-256: fd29b73166bd9a01f1cb2133d004034449b22563a20138227b0ed2abfb968cb2

Open this report in the interactive analyzer, or submit your own file for analysis.