Malicious PDF — malware analysis report

Static analysis result for SHA-256 d866ca26e5c4ae26…

MALICIOUS

PDF

73.2 KB Created: 2021-03-02 19:33:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: a3f657bf1ee7d5768d03ff556bfd4ec3 SHA-1: 83cdf95b467488d36a0a648c32d06d11e7aaacd0 SHA-256: d866ca26e5c4ae269e0fe78b9af791be0014adc707f5cfb655e6f49293fdd505
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of external links, many pointing to domains that appear to be part of a link farm designed to mimic search results for academic content. The presence of these links suggests an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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/wix?keyword=the+power+of+logic+5th+edition+answer+key+chapter+7 PDF link annotation
    • http://fukerijinexin.mygamesonline.org/is_it_safe_to_use_a_mattress_in_a_pack_n_play.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/4137873075.pdfIn PDF document text
    • https://zefimaral.weebly.com/uploads/1/3/0/7/130776827/fusinoki.pdfIn PDF document text
    • http://nanebaxexob.getenjoyment.net/dream_dictionary_teeth_falling_out.pdfIn PDF document text
    • http://it50life.pro/summers_heat_pellet_stove_inserts1l34.pdfIn PDF document text
    • http://probkin34.xyz/545001273074p8nx.pdfIn PDF document text
    • http://autolombardpro.ru/formacion_y_orientacion_laboral_tu_lyaluk.pdfIn PDF document text
    • http://yazansoft.com/driver_asmedia_xhci_controlleruafc8.pdfIn PDF document text
    • http://samelike.site/la_celestina_english_translation6qx4x.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/36828355788.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/febofit.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/articles_of_incorporation_sample_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/62143234680.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/how_many_calories_in_a_restaurant_chicken_soft_taco.pdfIn PDF document text
    • https://s3.amazonaws.com/xisefowu/nrc_assam_document.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/arris_sbg6580_wireless_default_password.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/robbery_bob_hack_apk_2.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/template_album_kolase_wedding_psd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/mabuf.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/potato_salt_water_osmosis_lab_report_discussion.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_off0000e02f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02F 5828 bytes
SHA-256: 84c2e18affc774c1d6726e1f8dcd1306f7d59f0475081933155a486610e67e7c
font_01_sfnt_off0000f426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF426 10256 bytes
SHA-256: 81c7403493ebf2d677c248c12413b6963f86e86ba9bcf9d5ad9fe97a5b55ef9a

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