Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bfd9b06087332f6…

MALICIOUS

PDF

78.5 KB Created: 2021-03-30 15:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 27ca1c7fef2befeddcfc7c8760b48a4e SHA-1: eef72bebbe51aed5afa421af9b8534a391e237cf SHA-256: 9bfd9b06087332f6b41d48a0a9a1fa65b65cf204d64a4e8bc5e3e95e298a62fc
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, and one prominent URL `https://zajinet.ru/strik?utm_term=music+to+heal+the+heart+chakra` which is likely the primary lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a strategy of using many links on disposable hosting, suggesting an attempt to obscure the true malicious destination or to maximize reach. No scripts were extracted, but the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

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://zajinet.ru/strik?utm_term=music+to+heal+the+heart+chakra PDF link annotation
    • http://makelemeg.mygamesonline.org/83064458342.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/judejovowujaledizomi.pdfIn PDF document text
    • http://help-verifiedbadgecenter.com/24364493844eq30z.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/cosmic_creation_hilton_hotemaofeq5.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/lonulowarukiwafej.pdfIn PDF document text
    • http://gidilakapajuke.mywebcommunity.org/83779192680.pdfIn PDF document text
    • http://talemine.getenjoyment.net/vipalutolikirun.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
    • http://bajupigirosinaf.atwebpages.com/78208008909.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a91fc5b9-2050-459a-a3ba-8d71c7702720/paint_by_numbers_with_frame_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa9bb3a9-8a67-4cab-90f9-8d426aade4f8/what_is_the_lucifer_effect_about.pdfIn PDF document text
    • http://sazebufaz.atwebpages.com/free_to_word_converter_software_for_large_files.pdfIn PDF document text
    • http://vigexosav.myartsonline.com/fegawapavelozowevenorerev.pdfIn PDF document text
    • https://677e6977-fc43-48b2-ac81-16e478c8573b.filesusr.com/ugd/3750c2_8a25f986bcda4bcaad770556ae12c0c2.pdf?index=trueIn PDF document text
    • https://a1104102-e7f7-498f-9db5-fd16eb5a1c84.filesusr.com/ugd/3f19aa_32f4ef260ede4096841f475ce319288d.pdf?index=trueIn PDF document text
    • http://zepuwiz.atwebpages.com/97005524777.pdfIn PDF document text
    • http://laxufazekez.atwebpages.com/sjogren_syndrome_adalah.pdfIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_baf99eeae26b407e85fdbd40615ac42e.pdf?index=trueIn 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_off0000e95c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95C 4732 bytes
SHA-256: 49db36c6222856a7b06ea8f7593b534ca4637a0b630d65d52c156a09218c497c
font_01_sfnt_off0000f986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF986 10448 bytes
SHA-256: 47dfe9b3f7e6ceaba0f193ebd9706a92a7f899686ff136c2783bfed5d227f1bc
font_02_sfnt_off00011d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D41 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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