Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f157279e79d57e…

MALICIOUS

PDF

85.1 KB Created: 2021-03-17 19:25:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: fef126909b71886f058325eae36efdc1 SHA-1: 6dc59a885ec45b7e5d49509928e98b17d2a2a79a SHA-256: 43f157279e79d57ef8ed8744b2f84d0c6f779ed789574353ed8a1c35cf09d55e
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with one specifically identified as a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of outbound links, suggesting an attempt to manipulate search engine results or distribute content across multiple sites. The ClamAV detection and ML classifier further support the malicious nature of this PDF.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/award?keyword=gst+annual+return+form+9+pdf+download In PDF document text
    • https://xavodujur.weebly.com/uploads/1/3/5/9/135972692/6015897.pdfIn PDF document text
    • https://dujemezore.weebly.com/uploads/1/3/1/3/131381607/nafil.pdfIn PDF document text
    • https://widegavadiwudux.weebly.com/uploads/1/3/5/3/135325068/6734881.pdfIn PDF document text
    • https://merasata.weebly.com/uploads/1/3/1/3/131378960/vegavusomufuk.pdfIn PDF document text
    • https://gabubogoko.weebly.com/uploads/1/3/3/9/133997439/3387f14134.pdfIn PDF document text
    • https://jovanifapekiba.weebly.com/uploads/1/3/0/7/130739678/73fb9ad5.pdfIn PDF document text
    • https://jusodizepo.weebly.com/uploads/1/3/1/0/131070216/morajuvuse.pdfIn PDF document text
    • http://ttop-shop.com/hay_pena_de_muerte_en_puerto_rico42po0.pdfIn PDF document text
    • http://7evenrp.ru/riravikevokenis2xpdh.pdfIn PDF document text
    • https://fosevikotik.weebly.com/uploads/1/3/1/6/131637163/detunemofafala.pdfIn PDF document text
    • https://sitoluvumoroge.weebly.com/uploads/1/3/4/7/134762666/3063185.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_ef4bc504ada84c61a1a834ebfa5759d0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/senodiw/is_ram_dass_dead.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/57666388398.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/mezuvesaketosaruxobu.pdfIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_21beb30a1c05457a81374b0da486a3c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/davubewu/beautiful_flowers_pictures.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/android_app_icon_template.pdfIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_48495f9ceece4be6a6e779f220344e38.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB0 5468 bytes
SHA-256: 07ae9da40fadae552d9eed281f444c6e51526cd22b27baf02ec9cbe5d72ec8c1
font_01_sfnt_off00012140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12140 11164 bytes
SHA-256: 8e2e7255685c36bc956d69b61f12c4f72a190ede70e7b0b5d57b5cb37aa5bfe8

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