Malicious PDF — malware analysis report

Static analysis result for SHA-256 73039581f0cbe4b8…

MALICIOUS

PDF

70.2 KB Created: 2021-02-23 19:14:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: df2abfd9e3afdbbf20cfced1ab3d35fc SHA-1: 3956b344d7654df35d7301524c1e5f2eb8072a7a SHA-256: 73039581f0cbe4b8afddfea1e8cd8ace51885e7b3eb0093a32254e9d1376bfc5
204 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://crophysi.ru/wix?keyword=retrak+selfie+stick+charging+instructions In PDF document text
    • https://static.s123-cdn-static.com/uploads/4426819/normal_5ffcaa72333d2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387562/normal_600df53808cee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457302/normal_5fdff3bb43bfd.pdfIn PDF document text
    • http://selozufuwadapuw.66ghz.com/activesheet._showalldata_class_failed.pdfIn PDF document text
    • https://cdn.sqhk.co/zalopubid/iTRxibQ/livafikabamebepegazub.pdfIn PDF document text
    • http://greatmasters.biz/what_do_you_mean_by_the_skin_of_your_teeth9vzbe.pdfIn PDF document text
    • http://vereffka.xyz/pelicula_completa_de_amor_y_otras_adicciones_en_espaolv568s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415081/normal_5ff79bea286c8.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonotiso/jfiecDi/numidokekurukukofa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454819/normal_600fb379ef4e8.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/XCgedic/zibiduwu.pdfIn PDF document text
    • https://cdn.sqhk.co/bemoranoz/ejahghj/ear_infection_symptoms_baby_congestion.pdfIn PDF document text
    • https://cdn.sqhk.co/mubikidom/e6geXic/jelox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://segigeserife.epizy.com/how_to_adjust_casio_g_shock_metal_watch_band.pdfIn PDF document text
    • http://bokubipojofoji.rf.gd/shutter_marathi_movie_free_utorrent.pdfIn PDF document text
    • http://fudodub.epizy.com/auditory_verbal_therapy_book.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_off0000d5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AC 5212 bytes
SHA-256: 520cfb67c28db87501044b5002ee9121e8f6118101501da6e075982c7350f53b
font_01_sfnt_off0000e769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE769 10732 bytes
SHA-256: 7fab866dd4d78b8fd6b5581bb0f3f9e0173f5f6e26da3817253003f0d8164c65

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