Malicious PDF — malware analysis report

Static analysis result for SHA-256 49e923940b949625…

MALICIOUS

PDF

255.2 KB Created: 2021-03-17 16:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 290f288bae252382857ed0c58eb9a76c SHA-1: 2a8d58fe75e8d6afb3302f7f5e06b3cd7f1713fb SHA-256: 49e923940b949625e76921be23d7e5e9dd12550413f819cf077bcbfe7829b36e
136 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a phishing lure, specifically using an SEO redirector to disguise a free download. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the presence of external URLs points to a likely download or redirection mechanism for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9737

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://pelibifir.ru/strik?utm_term=fujifilm+finepix+s1000fd+manuale+italiano PDF link annotation
    • http://bebetadiruj.mywebcommunity.org/network_security_tutorial_for_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450147/normal_604a92e376627.pdfIn PDF document text
    • https://fafenerukore.weebly.com/uploads/1/3/1/3/131398145/zariseviva_woboxokedin.pdfIn PDF document text
    • https://vetasokimatajed.weebly.com/uploads/1/3/5/2/135296406/2279539.pdfIn PDF document text
    • http://pinerapidsrr.com/glencoe_health_textbook_freexfla9.pdfIn PDF document text
    • http://believes.space/circulatory_system_diseases_list00awf.pdfIn PDF document text
    • http://mafuditovu.iblogger.org/centrelink_real_estate_form_mod_r.pdfIn PDF document text
    • https://jubagimijan.weebly.com/uploads/1/3/5/3/135333733/lonipiputes.pdfIn PDF document text
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/7675593.pdfIn PDF document text
    • https://vowizata.weebly.com/uploads/1/3/1/8/131856430/47a7a19db9e4c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495241/normal_601ac2377fb36.pdfIn PDF document text
    • http://sait-ok.ru/xidatixukdalu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469128/normal_5ff5ca7c1e847.pdfIn PDF document text
    • http://dream-stat.ru/tesda_forklift_training_requirementszlpba.pdfIn PDF document text
    • http://krepezh.guru/campark_t45_power_adapter67202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_6025a852141da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419642/normal_604dae97a70c3.pdfIn PDF document text
    • http://dofujifeluradep.medianewsonline.com/rutejubabilagozaroxi.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/troy_bilt_tb225_carburetor_adjustment.pdfIn PDF document text
    • http://lilubaxubaxulu.sportsontheweb.net/clearstream_2max_tv_antenna_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_b01dd62ca66e42c2b1823da39b57811a.pdf?index=trueIn PDF document text
    • http://dekifovep.epizy.com/hwoarang_tekken_7_guide_ps4.pdfIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_9b8ded4518094f12be8b0d6c0b94eb26.pdf?index=trueIn PDF document text
    • https://f7b0ef4b-317e-4f07-901b-4de91a029b50.filesusr.com/ugd/50f142_a8dffd9823dd4f5ba698d941e47c5fc9.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00039457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x39457 5384 bytes
SHA-256: 9bbabbd764121e6a789be653bba55bb15d193bec9eaf1095f446e4a88c690767
font_01_sfnt_off0003a6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3A6AF 15368 bytes
SHA-256: c00381652ff68cda1b3148bfec22546bb883ef65a22ea155746b2e972c805c87
font_02_sfnt_off0003d6b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3D6B5 16184 bytes
SHA-256: 73a6ce2df7b7bb3fbbbaa30d132b90941ba20c4bb6a24fcd4c5ccd6f7cf5f39c