Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c0332352a092c2…

MALICIOUS

PDF

73.6 KB Created: 2021-02-23 06:19:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 05ba7ecea4efedb827c49d6041c843ff SHA-1: de2af5d734bffff2be4a03a9af958cc76c893afc SHA-256: 28c0332352a092c2f36d3a66bd70d5280668eeb0d48a76875c1ce2036cc6d047
166 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it's a link farm and uses suspicious, invisible links to lure users to potentially malicious domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were extracted, the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://bologen.ru/123?utm_term=libro+el+poder+de+la+esposa+que+ora+descargar+gratis+pdf PDF link annotation
    • http://mkuu.club/wejusazumidumogagetujanhlb1e.pdfIn PDF document text
    • https://viledilexemapol.weebly.com/uploads/1/3/4/6/134698440/tabam.pdfIn PDF document text
    • http://lesantyqas.online/how_to_reset_timex_ironmanosq55.pdfIn PDF document text
    • http://jubemexor.22web.org/fowotozela.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464865/normal_5fd66f8d189de.pdfIn PDF document text
    • http://electorat.org/is_dominos_pepperoni_halal_in_canadab0i1a.pdfIn PDF document text
    • http://ig-supportcenter.xyz/bodybuilding_abs_workout_videos_freehkk1w.pdfIn PDF document text
    • http://bred-enligne.com/deep_learning_mit_python_und_keras_downloadce62t.pdfIn PDF document text
    • http://stavki.link/186243093903egmn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481072/normal_5fd18d2a1b2d9.pdfIn PDF document text
    • http://wagekelazutus.22web.org/aap_se_milkar_full_song.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421360/normal_6001efe3dac1d.pdfIn PDF document text
    • https://xepesirivow.weebly.com/uploads/1/3/1/4/131408502/e0997.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/33980857a18c71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465703/normal_5ffd89649764d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489732/normal_5fedce5311498.pdfIn PDF document text
    • http://instapriz.website/sijaraa1ruj.pdfIn PDF document text
    • http://creditinquiry.info/79905990793j07o4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xozujojunesu.epizy.com/accounting_theory_and_practice_notes.pdfIn PDF document text
    • http://xikisefux.epizy.com/hernia_inguinal_pediatria_cirugia.pdfIn PDF document text
    • http://gagelenobom.epizy.com/kevosesinoz.pdfIn PDF document text
    • http://davutawopoban.epizy.com/fijotuxidajovulula.pdfIn PDF document text
    • http://xoxexanizeb.epizy.com/zebide.pdfIn PDF document text
    • http://dololesorut.epizy.com/xezikomu.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_off0000dc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4D 5528 bytes
SHA-256: 3cfcf37823f3bb8667ad46d51455b960f498c03e30f72e7f553b355a0c8b4f7a
font_01_sfnt_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 13096 bytes
SHA-256: a4bca507d037abefa3402b1483f44e6c0b29840f868c5808893b734141a70a2f

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