Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d422f9bf60ca22…

MALICIOUS

PDF

80.3 KB Created: 2021-03-19 08:45:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 961caaf4d28069d9b2a00d933a73f81f SHA-1: b03a82e5138d122e1392120fbacee099a9774c5a SHA-256: 43d422f9bf60ca22079e4d99a108768a32ca540f31f335f36b6b9fac9b5c8803
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs and the PDF structure suggest an attempt to trick users into visiting malicious sites, likely for phishing or malware distribution.

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
  • 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://dafemum.ru/award?keyword=don+quijote+dela+mancha+pdf+instituto+cervantes In PDF document text
    • http://dadumuxuwu.iblogger.org/92362735923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493266/normal_60465c3cebc03.pdfIn PDF document text
    • http://bristol-yalta.run/gosewetetigy42r.pdfIn PDF document text
    • http://gukopujix.22web.org/lamokabigodisi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420034/normal_5fca5df969dab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488315/normal_6008283d4b00a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487191/normal_5ff1bf89a07de.pdfIn PDF document text
    • http://lifegirls.site/vilopojodupit6i3y.pdfIn PDF document text
    • http://acupofjacob.com/the_great_depression_and_the_new_deal_quizletgh5nn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371010/normal_6023feacc97b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451544/normal_6046e8aec8b98.pdfIn PDF document text
    • http://mabixegegixalez.22web.org/37249413822.pdfIn PDF document text
    • http://vuzitofakomuj.22web.org/area_of_composite_figure_worksheet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e1d5fa5a-667c-4d22-bb72-2ec96b4ed0f7.filesusr.com/ugd/01f30d_86e63d08bf444b67b467268ebadfbb71.pdf?index=trueIn PDF document text
    • https://5ac9d038-517d-4536-97f6-676423289421.filesusr.com/ugd/b444d4_f291a9a4f9af48209bf7f46a9ddf848e.pdf?index=trueIn PDF document text
    • http://vizawog.epizy.com/adepta_sororitas_codex_7th.pdfIn PDF document text
    • http://ruxofepugoloma.rf.gd/barfi_movie_all_song.pdfIn PDF document text
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_2f9b87bdf38b434bb066f6e11a91f33e.pdf?index=trueIn PDF document text
    • http://tisenunab.rf.gd/vinyl_decal_application_instructions_printable.pdfIn PDF document text
    • http://leragirifodoz.rf.gd/rainbow_magic_series_book_1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 5540 bytes
SHA-256: 159acff7e257d3fc4130a92f3a7b5b44d57f61ad27f43147e469e109ec8bb794
font_01_sfnt_off000102f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 10748 bytes
SHA-256: edce13f2b43e28609594dec5d4724893b554bab576b25bc05979e38ed4ca1972
font_02_sfnt_off0001259e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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