Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcc343eaf2c561c0…

MALICIOUS

PDF

75.4 KB Created: 2021-03-24 20:12:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bf1415c0f2e52b9113eca7bd93681a1c SHA-1: cd0002364db77b1783a93f3621f04ebcef652bc1 SHA-256: fcc343eaf2c561c0907f46e8adc91be4731969361ca1ca7aace6dc8a43cf7073
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and it contains multiple external URIs pointing to potentially malicious or link-farm websites. The PDF structure and embedded URLs suggest an attempt to redirect users to phishing sites or download further malicious content. No scripts were extracted, but the presence of numerous external links indicates a likely spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://seumenha.ru/award?keyword=pestel+analysis+definition+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402933/normal_603cacd5a4410.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369645/normal_5ff94512029a5.pdfIn PDF document text
    • http://waxevamebe.22web.org/verbal_reasoning_test_11_plus.pdfIn PDF document text
    • http://vusikudezewoteg.iblogger.org/a3_problem_solving_template.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366666/normal_5ff2286670a23.pdfIn PDF document text
    • http://jojiluvapesoj.22web.org/bodybuilding_vector_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406793/normal_5ff4d36d0220f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472491/normal_5fdb6b9922ca1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385217/normal_601bbc0e6a5d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480748/normal_60405a25e756e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ada59b67-f953-43c7-b253-cf6800b31fec/vurisexajinotas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b34daf2-ab66-4d56-9ccc-216904564db8/how_to_put_on_gentle_leader_leash.pdfIn PDF document text
    • http://vakorizu.epizy.com/43002001936.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76c58f05-f688-41c7-8c02-1503f0709771/shirley_jackson_short_stories_the_possibility_of_evil.pdfIn PDF document text
    • http://tuvatopuvonu.epizy.com/dying_light_weapons_crafting_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2acfe89e-1eee-4da7-91e5-1fb250671f8a/plt_increase_legend_size.pdfIn PDF document text
    • http://lolamidubafa.rf.gd/artritis_reumatoide_medigraphic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd4aa27b-e90f-4bfa-97ac-50db76f2c9ff/what_does_a_company_orientation_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/457855f3-7155-4f38-bb16-2e0f684d3d86/first_alert_chirps_3_times.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_off0000ebc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 5040 bytes
SHA-256: 2b51ab411d3ef577cec1e30e8cf475b97c1bce23406f43f8651b8602270f73d7
font_01_sfnt_off0000fd17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD17 10372 bytes
SHA-256: 8ee45b472589d33391adfc828763e3ec519902f586cc0c2eb1a2b0ee64d0760d

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