Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb6a0ca4dc1bfb2…

MALICIOUS

PDF

76.9 KB Created: 2021-03-15 11:44:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: e0d9ecc572811dc3d8dd496654c2b55b SHA-1: e7ea4724d0b4792c937b7f13b5fc96072b786616 SHA-256: 1fb6a0ca4dc1bfb26dae8ef100bb4e5b52f0c715c4e6006de62e72aa9ce6ffc4
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful sites. The document body is heavily obfuscated, but the presence of external links and the overall heuristic firings strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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=what+proper+nouns+are+allowed+in+scrabble PDF link annotation
    • https://cdn.sqhk.co/kowaziwaso/ifhgyic/saudi_data_flow_report.pdfIn PDF document text
    • https://xasamaxubema.weebly.com/uploads/1/3/5/3/135387487/7eccd215d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453115/normal_603488a9992e2.pdfIn PDF document text
    • https://beziremisolexew.weebly.com/uploads/1/3/4/6/134656792/bexutebefuwudojem.pdfIn PDF document text
    • https://cdn.sqhk.co/noruwotil/UUPWTgg/naxuzetolitot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403143/normal_5fd34cd1b23a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450418/normal_5fe7cf5c572d7.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/f73iaGq/miresexo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449775/normal_6021c406a5f5a.pdfIn PDF document text
    • http://nimolebefiv.22web.org/61226042667.pdfIn PDF document text
    • http://gulavimip.iblogger.org/android_10_gesture_navigation_app.pdfIn PDF document text
    • https://pefopurez.weebly.com/uploads/1/3/4/3/134375846/lugav-moxezapunu.pdfIn PDF document text
    • https://cdn.sqhk.co/voguzasijur/wjcibgj/secret_mission_spy_agents.pdfIn PDF document text
    • http://nitiwopororotef.mypressonline.com/gda_bye_laws.pdfIn PDF document text
    • https://rivirabuxi.weebly.com/uploads/1/3/4/6/134699302/fososazisaze-zurixamasimo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383475/normal_5fdf8dcbe8896.pdfIn PDF document text
    • https://cdn.sqhk.co/tejilunuf/hiSUiaX/rekosugezizu.pdfIn PDF document text
    • http://kifisafobubupo.mygamesonline.org/tofezabo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_db1bec336f7f4378bc5a3928c29d0679.pdf?index=trueIn PDF document text
    • http://jafepotafeno.epizy.com/combiner_deux_page.pdfIn PDF document text
    • http://vulikoviluxugu.rf.gd/billing_information_declined_app_store.pdfIn PDF document text
    • https://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_005920af5a844df29e8429e77ba21858.pdf?index=trueIn PDF document text
    • http://rabatelekovufar.myartsonline.com/fufanu.pdfIn PDF document text
    • https://9ebe8999-295a-4f11-87dc-c96f3e1b46ff.filesusr.com/ugd/8de238_3b9d9fffbed14130b10f42362a782582.pdf?index=trueIn PDF document text
    • http://sugizujesel.epizy.com/solezelojizizi.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_off0000f01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 5408 bytes
SHA-256: 24ddfa6f4d8b491760c5f58d6637e4519399abe1f1dcf96679ffe73ced4403ee
font_01_sfnt_off0001028c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028C 10596 bytes
SHA-256: d7a65a8b278b869b817f051c7329994fac4c91c17be808784884de2286b16c36

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