Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b03aecb797899af…

MALICIOUS

PDF

75.1 KB Created: 2021-03-19 14:18:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b28e4ebdb2e7b24288829a92ff7bbfc SHA-1: e1032efc30902dc7c5b84d33efd7651fed7e88dd SHA-256: 3b03aecb797899afead2baeccf8f2ec0a7a73ec1a81dabcbf561150a5e56a47c
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and an ML classifier. It contains a large number of external links, including one pointing to 'resalured.ru', suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and the presence of external links indicate a potential for malicious redirection or content delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=basic+knowledge+of+computer+science+pdf
    • http://servicesforsupport.com/pisotowifevukulifodato77kbn.pdf
    • http://pro-konditer.com/firegaketajanubiguvititaf6uy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pojikovewijeja/learning_autocad_plant_3d.pdf
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_06eab6211660427b8d0168dac74b3131.pdf?index=true
    • https://uploads.strikinglycdn.com/files/949501ab-909d-4b04-a36e-422a067c54ad/gozemaditilugub.pdf
    • https://e4034479-4ead-418b-af8c-5be8dc72bdbe.filesusr.com/ugd/1e8759_d5ed3af9bbf84e2b9cbffb4878ad1174.pdf?index=true
    • https://c7972686-9310-4d97-8ac3-15e828887225.filesusr.com/ugd/8a419d_811bd5e68d084c46acecf96ca1d94d19.pdf?index=true
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_5af3c0b54e2c44d5b78acf9cccc12159.pdf?index=true
    • http://xemefalokoxor.epizy.com/marathon_wr50m_watch_instructions.pdf
    • https://uploads.strikinglycdn.com/files/b6257418-e79c-4e22-8497-8644fa4f95dc/chicken_soup_for_the_soul_dog_food_review_dry.pdf
    • https://s3.amazonaws.com/tumasun/jinare.pdf
    • https://uploads.strikinglycdn.com/files/a5d001f0-c4b3-40be-937f-1b0c0fbfe3e1/see_me_nicholas_sparks_movie_online.pdf
    • https://be5a03d2-cb36-429a-bb4d-4773f067dd3b.filesusr.com/ugd/b46ca8_adc06ccff721465c872172301bc249cd.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c1b0d058-5ee5-4e16-9569-33c5b34292c4/novozizuzetop.pdf
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_cba8f22a65c04bd3824afcfbef817a75.pdf?index=true
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_3f1c87cfa13d4e578cf243d4ea5be963.pdf?index=true
    • http://bipulusesag.epizy.com/chicken_soup_for_the_soul_dog_food_ingredients.pdf
    • https://9d349da1-218b-4b59-9e37-2a90cab56d40.filesusr.com/ugd/de9003_25242114ea07480bbd6ac15fad34cf85.pdf?index=true
    • https://s3.amazonaws.com/bupaxomu/kezevetetutivavoteg.pdf
    • https://uploads.strikinglycdn.com/files/b6c7cb8d-d440-4e8c-825b-5e746cbbbe17/derivatives_of_inverse_trigonometric_functions_examples_and_solutions.pdf
    • https://994180ce-385f-4272-9833-4a204a825e0f.filesusr.com/ugd/ec0c41_dbca3c4117cd429d8d0c8be859ea7bec.pdf?index=true
    • https://a79fbd7c-12a6-44fe-9d3c-43dc2b0795a8.filesusr.com/ugd/f95141_9feeca4f6df64404b36e95cbbc714165.pdf?index=true
    • http://fepefemed.rf.gd/tanenixipokinusu.pdf
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e45e.bin
a596b67cc8e38e8404d455ce1eca2278a32c8dea825d023760a31e6ad4d3ee4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE45E 5680 bytes
font_01_sfnt_off0000f7ba.bin
8036de756521959fa145fce46813069cd29548861330f77618e317ae1a0e7868		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BA 11052 bytes

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