Malicious PDF — malware analysis report

Static analysis result for SHA-256 35b8f32233fe74e6…

MALICIOUS

PDF

84.8 KB Created: 2021-03-17 11:14:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 19a6bbb9aa34edb71015c3947eae8ce1 SHA-1: 74f0e4e9d0cdbbe55beab37de2bffbe8b0308f75 SHA-256: 35b8f32233fe74e6c6c1ed2632bc82cd9a2ee44151cd800fe640a3d502463dbc
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 0.9990

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://pelibifir.ru/123?utm_term=certificate+of+origin+form+b+vietnam PDF link annotation
    • http://znalomstvavip.site/android_one_mi_a1_reviewu3d0b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456998/normal_5ffe8488ca161.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460263/normal_5fce8c0d367e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417321/normal_603bf97d5e4ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408594/normal_60349ac148d3d.pdfIn PDF document text
    • http://republvinb.fun/scientific_abstract_examplesobo8y.pdfIn PDF document text
    • http://hookup755.fun/zavaxiwiy3b1p.pdfIn PDF document text
    • http://biggymstoe.com/java_8_download_64-bit_windowsutcte.pdfIn PDF document text
    • http://ueuniti.website/jamiz64uno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453537/normal_600f49be78f8d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471992/normal_5fec731005a1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475217/normal_600c77fc2d256.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zategafozasiru/15014050980.pdfIn PDF document text
    • https://9505ca4c-dfdc-4941-8fde-ded35496d0c9.filesusr.com/ugd/2097ab_f1d14db8b41e47adb627ca5829b4f850.pdf?index=trueIn PDF document text
    • https://c84d532c-3b33-47d6-96aa-4134a1164eb1.filesusr.com/ugd/6d45f6_82ef0839d78e4fe5abd39d3b582ae28f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vaxebisapesi/cpm_answer_key_course_3_chapter_7.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/cystic_fibrosis_management_guidelines_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/jaundice_treatment_guidelines.pdfIn PDF document text
    • https://e148473a-3d1a-46f8-b788-fbc1f5af68d4.filesusr.com/ugd/e1e70b_d2ff76e719714dbcac52636643fbf2e5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/mavakerugokavefuwi.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/batman_arkham_city_trainer_free.pdfIn PDF document text
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_61397b20b9094889b61761488241a4a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dofufiri/kexazawirivikerud.pdfIn PDF document text
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_c532da6aa1f344a3a5d773bb1b0bb6cc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF08 5004 bytes
SHA-256: a6420f08d28a45d30349a2280474b9d9ad4d9eb30d56cc53543dabf6abf4d34a
font_01_sfnt_off0000fffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFA 26012 bytes
SHA-256: d5abce6bccafe242821d4c734146cd48a41bca21dd1e6ebafbf6aa356f12ed56
font_02_sfnt_off0001377e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

Open this report in the interactive analyzer, or submit your own file for analysis.