Malicious PDF — malware analysis report

Static analysis result for SHA-256 377b45f433aee741…

MALICIOUS

PDF

73.4 KB Created: 2021-03-17 22:07:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 21d5768a79341a024b796212b1e0d932 SHA-1: b8e75c95b8c75bec42078d35d957554634840564 SHA-256: 377b45f433aee741f1df08c59e1bbf556cbf17ccb336224a2001490f4af955ff
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate a phishing or content manipulation attack.

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
  • 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://leonvi.ru/123?utm_term=mensuration+class+8+extra+questions+with+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404299/normal_6017157f984ab.pdfIn PDF document text
    • http://lomuwugevona.getenjoyment.net/sifegutitodate.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403822/normal_5fe92a01e7e2b.pdfIn PDF document text
    • http://mavogevuz.getenjoyment.net/tokojerezo.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/wavunot/91730522682.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/tojiz.pdfIn PDF document text
    • https://edefa294-c65c-46c5-840b-8a4669b9fdfe.filesusr.com/ugd/e4a001_a7d1b92c19af4d768d9b7d0d4a611f5f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/brendon_mccullum_photos.pdfIn PDF document text
    • http://nakeviw.myartsonline.com/3389114661.pdfIn PDF document text
    • http://livirava.atwebpages.com/56233220251.pdfIn PDF document text
    • http://rodiwube.epizy.com/lagu_another_you_brian_mcknight.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/23469628104.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/partnership_by_estoppel_occurs_when.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/how_to_solve_a_3x3_rubiks_cube_step_1.pdfIn PDF document text
    • https://s3.amazonaws.com/rurosaveruk/19212275971.pdfIn PDF document text
    • https://f1cb2ec4-a82d-4768-8a06-5236a2db220e.filesusr.com/ugd/a2e20a_a331121ca4314a51b3b9b399bd7af916.pdf?index=trueIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_a45caeaf067a4cd1ab4feb1066a399ad.pdf?index=trueIn PDF document text
    • http://xalesikejuxo.epizy.com/fisheye_lens_camera_apk.pdfIn PDF document text
    • http://nunitew.rf.gd/photosynthesis_lab_gizmo_answer_key_page_3.pdfIn PDF document text
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_6071cc01d7564c32a3634f5337262952.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_off0000de20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE20 5372 bytes
SHA-256: 022e99cfd41a1958dff826956e71eee758e7598beb983c9701640b6770acd44f
font_01_sfnt_off0000f082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 11640 bytes
SHA-256: 77e03c6b6e42e23a2a71d913ceeece11eb2982950a9d12f3efa92a6d91005093

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