Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ff73513c6e4549…

MALICIOUS

PDF

75.1 KB Created: 2021-06-08 16:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9807ab162e27c71a815e42b2f2af7f0b SHA-1: 1292012dfc6e3b8918e78d2c9faeda29d8759627 SHA-256: a4ff73513c6e454960ad4b17739621842465dfe2e0331f984bb54d9cedf9ec53
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://cructi.ru/pbw?utm_term=mol+weight+of+h2so4+%253B+5000+%253B+1.33+%253B+10.08+%253B+Low+%253B+0 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469836/normal_603517b41abe1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386594/normal_60067b815ad45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450733/normal_6043128e645d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443814/normal_6004cc8608cee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383586/normal_603434ef44a29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453729/normal_602e143d27467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374203/normal_602a19623a8a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_5fe8d2a3e6f9e.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/f757f789-6f68-44e7-8839-5080cfae4c16/math_addition_worksheets_3rd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ae74238-8201-4a1c-aa5d-b637f2475354/what_were_the_results_of_the_second_great_awakening.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/w/file/fetch/144664806/bioecological_model_of_human_development.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144424563/48503755136.pdfIn PDF document text
    • http://zusemivak.pbworks.com/f/27050579396.pdfIn PDF document text
    • http://togiwuvoze.pbworks.com/w/file/fetch/144447891/98029235128.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89ebac98-2c0b-411e-bd37-93c12d29ffc0/14768918244.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d962fd77-9158-45f5-ab48-867c3dacdc7e/82446644787.pdfIn PDF document text
    • http://juvudibip.pbworks.com/w/file/fetch/144861306/trane_xe78_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd6605c9-a4a6-46fa-9ac4-4c5065809174/masuvafadiv.pdfIn PDF document text
    • http://wixugigir.pbworks.com/f/download_pes_2020_mobile_android.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_off0000e7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AD 5856 bytes
SHA-256: e0b1815f8b53045eaa958a70b7e5eaf41c3a7a4d2f27c8090298beeb255a9651
font_01_sfnt_off0000fbe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE5 10352 bytes
SHA-256: 37ab72d9e927a38f0fee9bc5f1378cbae7d2c47aefc590cb424399620a4ce9ea

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