Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd8a73f2d378f503…

MALICIOUS

PDF

92.6 KB Created: 2020-11-13 23:12:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b16bec741b340b5e19cf871e40c1d1e6 SHA-1: 2afa2302d748b388e97c2593557a7dbebdcd739c SHA-256: fd8a73f2d378f5039a6711e7342a16ceb48b27802bc47e8d5881a9865f816df3
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text suggesting a lure related to 'series tests', and the presence of embedded URLs supports the attack pattern of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/123?utm_term=list+of+series+tests In PDF document text
    • https://cdn-cms.f-static.net/uploads/4386336/normal_5f93ef19679a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375207/normal_5fad75d7a3499.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_5f98701e78fa8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450418/normal_5fab9bd7572a5.pdfIn PDF document text
    • https://lekolusogi.weebly.com/uploads/1/3/4/3/134365603/092ce49a8a2e.pdfIn PDF document text
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/8023602.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4394072/normal_5fa80a7b27ccc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368243/normal_5fa857e79701e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425214/normal_5fae09ac5b29c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486054/normal_5faeda965b792.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://uploads.strikinglycdn.com/files/842218ac-e37c-48fd-bcc1-b27e820adfd8/85778230200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75ee063b-57d2-4a5c-8c2e-376de863382a/abecedario_en_letra_cursiva_mayuscula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0b74a4d-ef6b-43fe-adda-ee9d9fbb17f8/deluxe_dana_thomas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/848abde4-7f3f-479d-a511-a549ed44ea6d/67904623779.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_off000124c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C0 4144 bytes
SHA-256: c395daed984d5eab03462f35675f2c38a8d002bd4bebaf73caccd28d63691cff
font_01_sfnt_off000132d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D7 10716 bytes
SHA-256: 7471d43d5778fac727d79e0a493b33dcd960d7285af1c5fec61ed7361471852e
font_02_sfnt_off0001574e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1574E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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