Malicious PDF — malware analysis report

Static analysis result for SHA-256 4407ed1483599040…

MALICIOUS

PDF

89.4 KB Created: 2021-03-28 18:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ad80f07b8beb803fed9f8a7abe06c57d SHA-1: bd4990aabe3ce2cef98ada09b116940b4e8492cc SHA-256: 4407ed14835990402e508aa6503f3e2e91cb068727a20a85e4e6b250c8da213c
194 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it's a malicious redirector, specifically designed for phishing or malware distribution. The embedded URL 'https://dafemum.ru/award?keyword=neumonia+en+pediatria+tratamiento+pdf' is flagged as malicious and part of a redirector chain. The ML classifier and ClamAV detection strongly support its malicious nature, likely serving as a lure for users seeking medical information.

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.
  • 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.
  • 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/award?keyword=neumonia+en+pediatria+tratamiento+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367656/normal_600c8a712fc3f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482863/normal_5fefcf212f580.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/que_es_el_sistema_endocrino_y_que_funcion_cumple.pdfIn PDF document text
    • http://maxirem.mygamesonline.org/49517220626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_604b1c9cb2d1c.pdfIn PDF document text
    • http://fajasated.mywebcommunity.org/clinical_chemistry_michael_l._bishop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486981/normal_6059a6e86080a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcd8f3ba-4460-449b-9a21-304b71c8775d/91406877986.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/pexomebubefijulupul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8b35b4e-2940-40d4-9857-d18ec4d26f21/dont_tell_your_mother_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/33800734378.pdfIn PDF document text
    • http://donijexufenu.onlinewebshop.net/16464927531.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54b58eb8-7d8c-40b4-9be6-042d58bc8b2f/538222680.pdfIn PDF document text
    • https://s3.amazonaws.com/juvuraguvutoxif/aankhen_serial_full.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b29c517d-3c63-4f5f-b1d4-b77663e492cf/martin_weteschnik_understanding_chess_tactics.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/jodunarike.pdfIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/how_to_set_a_skyscan_atomic_clock_model_86730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6a6f578-6848-440b-bb1c-f1d45a383d23/how_much_is_a_first_class_usps_stamp.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/owner_s_equity_template.pdfIn PDF document text
    • http://punotonaduwize.atwebpages.com/xenani.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/venn_diagram_powerpoint_template_free.pdfIn PDF document text
    • http://rabatelekovufar.myartsonline.com/89074429991.pdfIn PDF document text
    • http://xasejumav.onlinewebshop.net/blockchain_developer_tutorial.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_off00011ee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE9 4948 bytes
SHA-256: 5a7d0154a113850c60e35f4329898b351ffa92be8017770bb5e84b35c8921b3f
font_01_sfnt_off00012fac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAC 11848 bytes
SHA-256: f875560812da02564178cc3ac19df220d629e092dd2d3f0a6a1301c6cacecef3