Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e497e11a8d1612…

MALICIOUS

PDF

74.3 KB Created: 2021-04-05 10:56:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13d694f9ecacbde077fd77bc901c2aa4 SHA-1: ca3a29525bbf11e0d19027a23e1bd040a24d6be5 SHA-256: 53e497e11a8d16129f53635b0d3d9eb3fbd6352350e40a5d7e3c1ca280ec483a
96 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristic firings indicating malicious content, specifically a phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the detected threat point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/123?utm_term=ribbon+banner+vector+free
    • http://murimubijejaba.mygamesonline.org/expanding_tactics_for_listening_third_edition.pdf
    • http://gesamakim.22web.org/43454126242.pdf
    • http://ponemofetu.scienceontheweb.net/muscle_fitness.pdf
    • http://suzupuwejal.mygamesonline.org/pdf_creator_sourceforge_full_download.pdf
    • http://xifutipixa.mywebcommunity.org/golegosalala.pdf
    • http://razvivatel.blog/83230690973iol2z.pdf
    • http://relodifalixogo.scienceontheweb.net/figexijenebisugezewedawu.pdf
    • http://mijogunabisojil.iblogger.org/aspirator_nazal_manual_chicco.pdf
    • http://bio-ita.fun/tudakidvh2y.pdf
    • http://dwatches.site/daniel_plan_intermittent_fastingf91xb.pdf
    • http://xojuxelase.medianewsonline.com/2085860033.pdf
    • http://wordsideget.top/english_books_for_kidsy56u3.pdf
    • http://vijexibat.mywebcommunity.org/jabanulepixuworirev.pdf
    • http://pushbiz.fun/zubedaprhmn2.pdf
    • http://lumejaramelu.mygamesonline.org/25825022589.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://digifasofow.rf.gd/57233560640.pdf
    • https://uploads.strikinglycdn.com/files/0552e9e2-732c-4fda-9fe0-c9d61219c389/68883895652.pdf
    • http://bugamaxu.rf.gd/nerasezesunomivusazazu.pdf
    • https://uploads.strikinglycdn.com/files/33e73cad-521c-47f7-8bd0-781cbe19e72e/duzaxikuwigewanepep.pdf
    • https://uploads.strikinglycdn.com/files/2b419424-a040-41be-811d-7bccade7df7d/miniature_dachshund_puppies_for_sale_nyc.pdf
    • https://uploads.strikinglycdn.com/files/0e657844-04e7-4f10-a73a-b0bb3a40a6f8/kaplan_ged_practice_test.pdf
    • https://uploads.strikinglycdn.com/files/c4b6a1d2-83e0-4ac9-9a33-2baa1e77caea/dewoxuwivome.pdf
    • https://uploads.strikinglycdn.com/files/aa0b0b4d-a3e6-4b50-aa64-06815bb51960/tips_on_writing_academic_essays.pdf
    • https://uploads.strikinglycdn.com/files/a81259e1-87a4-4283-8f07-0971636bebbb/pidutelibebadupet.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
    • 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_off0000d16a.bin
818236a103f0ac87cf38feabe009b2a67de562407f14f6abfbb8da0486d66585		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD16A 4872 bytes
font_01_sfnt_off0000e222.bin
038ced99ffd46ef93ea5b6389998256a2cb3e41ba287ebe3290e5e3b92bcd756		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE222 10704 bytes
font_02_sfnt_off00010556.bin
bc6d684f813ac1c32be8bd0fe15b7813cdddcd900b6f98dcbbe4bb93017ec79b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 16448 bytes

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