Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c1cb9b700239c0…

MALICIOUS

PDF

78.1 KB Created: 2021-03-29 18:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5d119774d1a8e70358dbebe68eb3c402 SHA-1: 53c7d447b04b8d261c0d667d6d524cdf6d285271 SHA-256: a4c1cb9b700239c0c4e6bd7a5a8c7d8ae6404e7613d8bbc078cf575bf460298a
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 0.9998

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://ponafet.ru/aws?utm_term=ancient+greek+art+lessons+ks2 PDF link annotation
    • https://ginuzakonufa.weebly.com/uploads/1/3/2/6/132681862/badavitusotiku_guxigubifide_laloxela.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412896/normal_601a631447b4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451556/normal_60062bc51eece.pdfIn PDF document text
    • https://nosuxiseliv.weebly.com/uploads/1/3/4/5/134578333/7380036.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407102/normal_60066c771eb31.pdfIn PDF document text
    • https://mijekuwovosi.weebly.com/uploads/1/3/4/3/134321571/womeja.pdfIn PDF document text
    • https://novifabapidujup.weebly.com/uploads/1/3/5/9/135975767/df5fe0303.pdfIn PDF document text
    • https://seruvexude.weebly.com/uploads/1/3/4/4/134404645/godowudawisorewijoka.pdfIn PDF document text
    • http://kubosikavudux.mygamesonline.org/circle_of_willis_stroke.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/dewutexorob/android_update_for_asus_zenfone_5z.pdfIn PDF document text
    • http://namakanexir.atwebpages.com/othello_act_1_scene_3_analysis_genius.pdfIn PDF document text
    • https://s3.amazonaws.com/gumagabu/35101920831.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/34574273500.pdfIn PDF document text
    • https://8ea4a4fb-2859-49e6-8c89-66ed49166bb4.filesusr.com/ugd/0088c1_93dcc8560d3a49ddb0f1463206a34d16.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e353fa5b-c687-4bac-a83f-c5e281a0b8dd/pudomaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a815521e-28f2-450f-942f-2f1720ab0c0c/salary_of_chemical_lab_technician_in_canada.pdfIn PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_83d2c552c1ef45e8926b574a76342fd0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/suximawo/mawox.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/an_introduction_to_mathematical_cryptography_solution_manual.pdfIn PDF document text
    • https://18e99e0c-7034-4a8c-9069-267580a295b8.filesusr.com/ugd/b337f5_0b18e77f19694f0ea39121930d021ec2.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_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 5152 bytes
SHA-256: 36cd092131824f6b733bc2c095f6a370315687d9234b07180084e54f70e66cb1
font_01_sfnt_off000105ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AD 10588 bytes
SHA-256: b756ced9e46739403f526a7a3c623e5505a51e601a336d3f6334bde7845e2d3b

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