Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bbf02b157b4de32…

MALICIOUS

PDF

77.5 KB Created: 2021-03-17 08:53:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 20f1d736ad7eb72b9bbeb96d89f66e1f SHA-1: 8cc1a31d297a4fb6cf11a43bcf85e4fea7ee2de1 SHA-256: 2bbf02b157b4de320a45ee105c1ce291ddc883931715086080eed0a254909b51
156 Risk Score

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 0.9993

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://jumiwimov.ru/strik?utm_term=how+to+write+an+apa+style+research+proposal PDF link annotation
    • http://mozuganimaf.66ghz.com/3519453113.pdfIn PDF document text
    • http://kerutugizuxig.mygamesonline.org/how_many_carbs_in_large_dunkin_donuts_coffee_with_cream.pdfIn PDF document text
    • http://rejorevubirobu.sportsontheweb.net/rocephin_davis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410016/normal_603c7a7636fd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380214/normal_60051241207cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407306/normal_600e8b0c1217a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374979/normal_60504fbb57ea5.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/mejigavukolu/physically_handicapped_certificate_application_form_odisha.pdfIn PDF document text
    • http://nasotigide.rf.gd/cognitive_psychology_applying_the_science_of_the_mind_4th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/zodererezuzuxi/roxag.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/the_odyssey_book_xiv_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/lodger_contract_template.pdfIn PDF document text
    • http://nepupiborama.rf.gd/kinematics_and_dynamics_physics.pdfIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_5560d9f02bb84febb4c2e88dcc2a9c8a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebbc06d6-5a34-49d3-9f49-0a26c39276da/wejozoxolagepugisijewu.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/79148072855.pdfIn PDF document text
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_049b86c3f4a44a3e85cfa4327fbf6069.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/700479e7-f74a-4b79-a649-70dc2081e98c/riwivujijitusenurojolatod.pdfIn PDF document text
    • https://3b87a2b8-2d13-4e6d-acc4-cbba57692a59.filesusr.com/ugd/50988c_7365a7ed4f0c478cb395e9066535620c.pdf?index=trueIn PDF document text
    • https://8d59741e-369e-44be-b01e-8fbcb09d2d01.filesusr.com/ugd/7cefa9_c11f6bc613954f2bb214955cde62ead2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/34141eef-6328-4dc4-a1dc-dd1d37ccdf31/chapter_20_building_vocabulary_politics_of_the_roaring_twenties_answer_key.pdfIn PDF document text
    • http://gusutawidike.epizy.com/joxitofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/215a342c-02e2-4a1c-9495-4c9799efb3e9/what_are_the_types_of_country_music.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_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 5176 bytes
SHA-256: 24086d3dcb70057575bae0e882510e7276203d83fa2c9d0087b74fd5f4708e8e
font_01_sfnt_off000104e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E3 10640 bytes
SHA-256: 6913f04b78d10e9fc2c7d764de9af91d1acd6379ebf535c16c26a99e0457b027