Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffecfcf2a1520cd2…

MALICIOUS

PDF

68.6 KB Created: 2021-03-30 00:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a7a592f5ecaa2c9cb529ae7f45a903e4 SHA-1: 8f8ebe09d9165c6e9b93c24fcdd8662ee364982c SHA-256: ffecfcf2a1520cd262d4f61ce42d5e815b13ba497b758a0419fd011aa9c6b098
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://jacksth.ru/strik?utm_term=inequality+word+problems+worksheet+pdf PDF link annotation
    • http://iciapp.xyz/true_to_the_game_2_book_review7544v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417123/normal_60331d9397047.pdfIn PDF document text
    • http://rabota-plus.club/4th_grade_go_math_assessment_test_printabletee4b.pdfIn PDF document text
    • http://pumba.fun/download_slumdog_millionaire_sub_indoxinjh.pdfIn PDF document text
    • http://physcoo.com/juvulodifija7z6dw.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/how_is_social_learning_theory_used_in_social_work.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477913/normal_5fd21d5967a52.pdfIn PDF document text
    • http://energierecrute-emplois.com/vudavobijnhcp5.pdfIn PDF document text
    • http://rusakova.space/generative_adversarial_networks_with_python_jason_brownlee4911g.pdfIn PDF document text
    • http://copyrightproblem.com/hd_wallpapers_for_laptop_1366x768_freey1e9z.pdfIn PDF document text
    • http://nonimejusujajo.22web.org/bosofine.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/b5bced79-988e-4c82-8276-b2cc069f5fcd/25332634912.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f496a48e-98bd-4b7d-9a74-34033a2d2227/dotisiranuwididefepogus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95d94eb7-715f-4c50-bc84-f2c1ad42bc91/vermont_castings_defiant_1945.pdfIn PDF document text
    • http://dilakibuj.rf.gd/ravowamumonef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e51ead-5ffb-4c3f-a78a-6bf539746a51/how_to_analyse_experimental_data.pdfIn PDF document text
    • http://bugenerefajujus.atwebpages.com/5708006874.pdfIn PDF document text
    • http://nevafofuvabovid.atwebpages.com/wujegoz.pdfIn PDF document text
    • http://vadivin.epizy.com/96665334394.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_off0000cd51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD51 5744 bytes
SHA-256: ce2e940b5fb11e9c7df9539ba457d75d6413b9df1aeac6954a43410ed3eb2886
font_01_sfnt_off0000e0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C6 10444 bytes
SHA-256: a794afc27077ae3ca96214c7120b49072d5fb89a4fe132d9b17e530e039bce2a

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