Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38668313296f00d…

MALICIOUS

PDF

87.4 KB Created: 2021-03-27 19:59:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df9533866d0238685225a59d73e3e318 SHA-1: e66698d8b1d9d7b0e7fef4765474443271960a67 SHA-256: d38668313296f00d1c688ec92b1129ced7a54cbed4a18d30b1e838e883a9296a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized and point to potentially malicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or redirection scheme. The primary malicious URL identified is 'https://resalured.ru/award?keyword=angle+of+elevation+and+depression+word+problems+with+answers+pdf', which is likely used to redirect users to further malicious content. Although no scripts were explicitly extracted, the presence of numerous external links and the ML classification strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/award?keyword=angle+of+elevation+and+depression+word+problems+with+answers+pdf
    • http://pusewuvi.medianewsonline.com/grade_12_biology_textbook_mcgraw_hill.pdf
    • http://italy50wow.pro/what_kind_of_battery_does_a_dodge_key_fob_usemgemt.pdf
    • http://jigikujed.scienceontheweb.net/taking_sides_clashing_views_in_abnormal_psychology.pdf
    • https://cdn.sqhk.co/duwutawuna/jbnhcib/facebook_logo_aesthetic_red.pdf
    • http://fakaripeti.xyz/mendota_fireplace_insert_efficiencyd2nj1.pdf
    • https://cdn.sqhk.co/jesotipo/icithi0/skylanders_trap_team_villains_wiki.pdf
    • http://pixunune.sportsontheweb.net/christopher_hitchens_ten_commandments_vanity_fair.pdf
    • https://cdn.sqhk.co/gumojitoxowu/vhb4bSq/92598272726.pdf
    • http://digitaloffice24.ru/gubuvovelawetajilij8qyn.pdf
    • https://cdn.sqhk.co/rirelolut/bt138ml/53267469221.pdf
    • http://instapriz365.site/example_of_introduction_psychology_lab_reportqffdh.pdf
    • https://cdn.sqhk.co/zotofoza/mhehiFS/nbc_connecticut_ct_live.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/resisuna/specimen_certificate_of_identity_residence.pdf
    • https://s3.amazonaws.com/pewebopufupe/banquet_event_order_form_template.pdf
    • https://s3.amazonaws.com/dugibabafod/que_es_un_estudio_de_prefactibilidad_de_un_proyecto.pdf
    • https://s3.amazonaws.com/bupaxomu/hollywood_horror_movies_2015.pdf
    • http://tavoxelelenasi.onlinewebshop.net/wii_error_message_50299.pdf
    • https://s3.amazonaws.com/tetofamuxulil/gijufoteripodamitibotemal.pdf
    • https://1347de4c-4e54-429a-b84c-372e60bc5a2b.filesusr.com/ugd/6c98bc_3728ffcb3759453ab6460f0cc3c2124f.pdf?index=true
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_92587f3be36b46b5a7c8a6b872ff56b7.pdf?index=true
    • http://memamawu.onlinewebshop.net/cytology_book.pdf
    • https://091a8774-b5bd-4fb7-8799-8d1ca0ca44ad.filesusr.com/ugd/8716ab_2dbe8c66955b4b57bfb77f6ff00ab80a.pdf?index=true
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_0131b7f9e876443f84e564c0cc84de70.pdf?index=true
    • https://s3.amazonaws.com/jinotugiwomo/5597305792.pdf
    • https://s3.amazonaws.com/dazifozixawus/46452366648.pdf
    • https://s3.amazonaws.com/luropiw/51580207079.pdf
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_0430131adf5745acbbbb199096662b58.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc43.bin
56fbda3d08026b2c05ebfb6cbfc4692ec2eadab8e99374b8d48cb8f5c319733b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 5736 bytes
font_01_sfnt_off00010fb6.bin
b169dc92ad74cd6acdd500d087cebedecd7ef015b5998db8240d7cd6a1214dc1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB6 12188 bytes
font_02_sfnt_off0001397f.bin
226c7799e08663417c23787dc255f055761e953a3c26422f3c655619641523d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1397F 16184 bytes

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