Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3dcfa63fbd6cfd…

MALICIOUS

PDF

75.0 KB Created: 2021-03-21 04:47:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e5c5a0267a34aa0f90b99266d0e9ce55 SHA-1: c1854c6c4bd26d6eacd891a8aa420ff18037ce2d SHA-256: fa3dcfa63fbd6cfd4b1048f14c2c62d20291583fec03c3047eaf0421d890620b
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to disposable domains, many of which are flagged as malicious redirectors or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were extracted, the embedded URLs and heuristic firings point to a common pattern of using documents to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://yafferge.ru/123?utm_term=free+normal+distribution+excel+template In PDF document text
    • http://mirumumavetifun.mypressonline.com/sketchup_make_download.pdfIn PDF document text
    • http://zujugowez.iblogger.org/pevomolupoxosap.pdfIn PDF document text
    • http://kikaxefe.22web.org/wavavenoz.pdfIn PDF document text
    • http://nutristrike-shop.ru/noxugujevanuxeroderubwsosi.pdfIn PDF document text
    • http://visobewitumimek.22web.org/baahubali_2_tamil_movie_audio_songs.pdfIn PDF document text
    • http://fejavodexata.getenjoyment.net/viwik.pdfIn PDF document text
    • http://fevofawemuwa.medianewsonline.com/b._com_3rd_sem_syllabus.pdfIn PDF document text
    • http://dsv-trening.ru/lowadefow0nb4j.pdfIn PDF document text
    • http://nanebaxexob.getenjoyment.net/14474574044.pdfIn PDF document text
    • http://unlockdeals.shop/2009_jetta_2.5_transmission_fluid_changedig4x.pdfIn PDF document text
    • http://alcozerox.com/rhapsody_in_blue_orchestra_score1k782.pdfIn PDF document text
    • http://jetotujaj.iblogger.org/buriraso.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zabevog/estadistica_descriptiva_e_inferencial.pdfIn PDF document text
    • http://dogugamegomijit.rf.gd/10893322095.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/mandated_reporter_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b771fa3d-9d4d-43d2-b2b1-e689fd608dc6/77011980380.pdfIn PDF document text
    • http://dibojun.epizy.com/kitabu_cha_biblia_takatifu.pdfIn PDF document text
    • http://widevuwototavu.rf.gd/95659508553.pdfIn PDF document text
    • https://s3.amazonaws.com/suximawo/math-_drills_answer_key_rotations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87fc787d-3486-48d6-877a-ca49fab56d85/gamizofowagulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f505d120-eac1-4fa4-948e-a747154b9ef8/vomulix.pdfIn PDF document text
    • http://lepoxas.rf.gd/27503555255.pdfIn PDF document text
    • http://retiziwo.myartsonline.com/b._ed_books_in_english_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/580dca51-a077-4070-a0b9-d986c0b72d91/48218172388.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_off0000e6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B4 5384 bytes
SHA-256: 58e0bb2b609630d5f1c6e1f2a44cd6beb519cb43f441436040ccf06a4bb033b0
font_01_sfnt_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 11084 bytes
SHA-256: dd634cf7532fbf30ca0cf6b189f436c8e79a209cc3ba18cb9d9b933875033426

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