Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd901f55868b3e04…

MALICIOUS

PDF

82.0 KB Created: 2020-11-19 15:29:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9f2c8b56b3c4ec1828ae6f304c25a566 SHA-1: ddc3be9cde2e125fca107247db285cbe4d914998 SHA-256: fd901f55868b3e044185a1177c43acc1d6a9e90d2cda49e1ffa7e980a768656b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffnew.ru/123?utm_term=florence+nightingale+syndrome+tv+tropes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4381105/normal_5fac277000299.pdfIn PDF document text
    • https://baxelawinojiw.weebly.com/uploads/1/3/4/3/134333718/zuwiwi_xitofat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370097/normal_5f9f77139cf0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471081/normal_5fae54758a9bd.pdfIn PDF document text
    • https://duvupobilalef.weebly.com/uploads/1/3/4/6/134630448/wavej-rivugolidumip.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/9913d8e4-b78d-45e7-9284-bb6948492264/budazisi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e669b96d-3b04-41df-a85e-ead2ea037c04/qss_trn_tp_link_l_g.pdfIn PDF document text
    • https://s3.amazonaws.com/fowonaxul/vupetudum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a9e2e70-1e3e-4414-85b6-8800deb71577/4091549938.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/lotane_associates_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53a9dbef-a146-4c76-976d-5507d2448540/59417965873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e99c1ea-e1b2-4d22-b916-e1c468b54ee3/51226727779.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b73e5d7-9cc5-4da5-8af7-0b31a76b3c33/81830433072.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001029e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029E 5604 bytes
SHA-256: fc876e8b2746cf062582ea5899cd266dea40d5b14d5f45a05e908f5815936c69
font_01_sfnt_off00011593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11593 11160 bytes
SHA-256: 5f836f4fa4315e40d1f231fdfdde7d7aeaac81b726eda07faa65642627eb2992

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