Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cdacddf7e259bcf…

MALICIOUS

PDF

67.9 KB Created: 2021-03-21 00:56:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 00e8a751cd6312065df04c85a8f02cc3 SHA-1: 5cd5b521bba0edea4dfb9074e5cc76b273421b0d SHA-256: 5cdacddf7e259bcf3e282fc20c734381e2b08157a63ce10ac2681e1d5c08df6e
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded links, many of which point to external PDF documents hosted on disposable domains or known malicious redirectors. This behavior is indicative of a link farm designed to distribute malware or facilitate phishing. The ML classifier and ClamAV detection strongly support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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=technical+drawing+for+fashion+pdf+free In PDF document text
    • http://zijaditenup.getenjoyment.net/kinds_of_adverbs_exercises_with_answers.pdfIn PDF document text
    • http://dapajibidamazed.mypressonline.com/kusefuxudavodakinimupew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479925/normal_601705f79a64e.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/35474446243.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450883/normal_601165ab5def5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488102/normal_602602b1d7730.pdfIn PDF document text
    • http://gujozulogisin.scienceontheweb.net/fidixu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485012/normal_5fef15b7ceb9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383680/normal_60018df215f56.pdfIn PDF document text
    • http://tijukilebag.getenjoyment.net/old_magic_chef_stove_knobs.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/594b36e9-4e6b-47c2-9be0-7176d3b02c07/how_to_change_name_after_marriage_on_driving_licence.pdfIn PDF document text
    • http://nupuzawov.onlinewebshop.net/core_java_quiz_questions_and_answers.pdfIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_834bbe0b91ca4a35b3fa44c6b66d29fe.pdf?index=trueIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_037b5126b37d4149a407199a0b6a2d4c.pdf?index=trueIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_6c255133cc92489cb574d63d6840438c.pdf?index=trueIn PDF document text
    • https://6129906d-bc82-46a7-99f5-71793a58af3c.filesusr.com/ugd/d162e3_a79bd2c35abf486fb3211efef0a54aff.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf715303-4f25-44e7-9569-85f582f28efb/kesizuvejujofexokawexob.pdfIn PDF document text
    • http://japamitafixe.myartsonline.com/vidoxazadofozul.pdfIn PDF document text
    • https://e41bb7a9-a35b-4578-ac27-1eab720d379a.filesusr.com/ugd/8912ce_6a820386890e44478d3f9f466e49f8e5.pdf?index=trueIn PDF document text
    • https://bbaef297-c986-4b42-acb3-0fd65605e280.filesusr.com/ugd/e9fc71_fdcd055d3cd94321adbef72747babd08.pdf?index=trueIn PDF document text
    • https://041f977c-1598-48cb-b578-3d63f550c8ab.filesusr.com/ugd/524ae3_fe860f2cc503451d82f89476111f68c7.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_off0000cb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB90 5456 bytes
SHA-256: 7c3d3a48ec6d76130ff49d5cf6500f96926a3c367b172c1ff2ee1d76a7dd1703
font_01_sfnt_off0000de31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE31 10584 bytes
SHA-256: 1e26bfbd1b805ae03113dcb467319b092d5f097655b26cd376bf640ac29f6be3

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