Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf4583ae41a5903a…

MALICIOUS

PDF

81.5 KB Created: 2021-02-16 12:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: b2cda86e0ef2df3651567b1faaaa7d28 SHA-1: 350ce35dca3e96889ebcc7c1b78f49c76fab8512 SHA-256: bf4583ae41a5903a3b87a52cc5e5346393099de96185e34e61b6648093da3559
126 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, indicating a phishing or trojan payload. It contains multiple external URLs, including one that appears to be a search result lure. The presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://maypoin.ru/wb?keyword=how%20to%20find%20aa%20meetings%20on%20zoom PDF link annotation
    • http://cparta.moscow/golmaal_again_song_videoxtk2p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373755/normal_6014cef4900c3.pdfIn PDF document text
    • http://velesvoyage.ru/garcia_jeans_size_guidejufe3.pdfIn PDF document text
    • http://bioforcecolumbia.site/donukomosulapexobobumowa7bs2m.pdfIn PDF document text
    • http://bigonetudukori.iblogger.org/lenerumalavupafo.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/jeVW7v8/62978878334.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486969/normal_5feefcd293698.pdfIn PDF document text
    • https://cdn.sqhk.co/mewedenemez/ijcsIgg/tawanifumunezuwakopilu.pdfIn PDF document text
    • http://daravto18.ru/927903326263g3br.pdfIn PDF document text
    • http://presentinsta.site/kozodubuduwujuzonovuta28led.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414679/normal_5ff2be0bf348b.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/hXPhgKW/gaga_live_video_chat_app_mod_apk_download.pdfIn PDF document text
    • http://phrensy.co/vulisorarituxiluvuzebrzxe1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451217/normal_601dcb18e7f2a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kotenu/12664152816.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/limiting_reagent_worksheet_2_answers.pdfIn PDF document text
    • http://dujofaxuro.rf.gd/suzewikorukixese.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/passport_renewal_application_form_ds-_82.pdfIn PDF document text
    • http://vixoboguwexalo.rf.gd/56272834539.pdfIn PDF document text
    • http://nadezuj.epizy.com/fitted_bed_sheets_on_sale_canada.pdfIn PDF document text
    • http://notaruk.rf.gd/affidavit_of_support_form_i-_864a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF390 4992 bytes
SHA-256: 3bd912496b9046ff536753f3e5283ae36fca66e9abdcd2558d5ad016566a35c6
font_01_sfnt_off00010492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 11172 bytes
SHA-256: 08187f9722200510d159f3df82c75407f1d722bdfd1521dc5bc1ccfbd9d31bb2
font_02_sfnt_off00012ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB2 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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