Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb31252be268085…

MALICIOUS

PDF

90.5 KB Created: 2021-03-25 04:35:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: fc27d5f5b01aef123b567cbceac74a11 SHA-1: b06297f87b522a7ce181c457dcd6d35c10c56277 SHA-256: 3cb31252be268085791d2568fece4b21bf1f4715b23de72c702ebb455eb48a7e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest the document is designed to redirect users to potentially malicious sites, likely for phishing or to download further malware.

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 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://soxebez.ru/123?utm_term=stepper+motor+basics+pdf PDF link annotation
    • https://nodokesomizi.weebly.com/uploads/1/3/4/6/134656280/ae2857fabf855.pdfIn PDF document text
    • https://zuzameponotu.weebly.com/uploads/1/3/1/6/131606203/famowidezonorom.pdfIn PDF document text
    • https://mexulurobe.weebly.com/uploads/1/3/6/0/136057308/9982775.pdfIn PDF document text
    • http://zespodsvetkoy.site/dagolilijimavexie7ubg.pdfIn PDF document text
    • http://afracheat8.xyz/phoenix_arizona_weather_january_2020gl81z.pdfIn PDF document text
    • https://dalosetog.weebly.com/uploads/1/3/1/4/131412235/wisivefego.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/nerusovu.pdfIn PDF document text
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_6c1e6182108e4363a7e6734af1bf67bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d49110b-7cbb-4617-b7ef-354af704f462/jewizamunanelirozuvake.pdfIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_b7b2d38b129b49c680010e707225816a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zesixefe/7454910630.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/how_to_set_up_airprint_on_hp_laserjet_pro_400.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97406b7d-e8e2-46ec-b17f-5d815c61c3d1/royal_navy_medical_assistant_salary.pdfIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_d44f3b8d233d43a081a40e0c7e89387d.pdf?index=trueIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_31fb23a7db3e44c184b7c7388fbe43d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/81b35e4b-3403-400b-b978-9f04af913f87/hacer_una_corona_de_adviento_para_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d55481c4-b365-4064-8552-a65c97fa4062/where_can_you_buy_the_walking_dead_comics.pdfIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_d0274d8119a84a2bb7ce010176e27afa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pidufozu/feminist_epistemology_definition.pdfIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_90926089cdab4bb184cf38d8fd804515.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_off000121d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D6 5512 bytes
SHA-256: 7932c8fcebca79993e228291213282a3121528aca2cee06f52ad7d963dad6e47
font_01_sfnt_off00013470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13470 12056 bytes
SHA-256: 9a14503c985289679b2448035a6a392ad9d44e7171564c1a453e4dea57769b16

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