Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a4eaedc056e896…

MALICIOUS

PDF

77.8 KB Created: 2021-04-25 12:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c55f01f80249116a9c1aea8f795fd686 SHA-1: 138dded0a332e67716c51ae569e6ead26a57541d SHA-256: 35a4eaedc056e896d8fb1e1d52a3e91549f209b5cc547f4ad4e99562d9261d93
186 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 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/strik?utm_term=interview+questions+and+answers+for+freshers+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479436/normal_60242c8a04866.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405194/normal_6055cfeb71ba4.pdfIn PDF document text
    • https://lusogovo.weebly.com/uploads/1/3/4/3/134358567/zopuselenufomibukutu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416502/normal_602aa0b99c6dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482402/normal_5fee07078f91e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447878/normal_5fe2a0d77a4c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389805/normal_5fe8ee19e0006.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410956/normal_5ff9ef72edacc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376369/normal_6016671287f46.pdfIn PDF document text
    • https://jateredadiwez.weebly.com/uploads/1/3/1/6/131606262/mopokeloxu-valufo-potut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483854/normal_5ff93a73d82b8.pdfIn PDF document text
    • https://gabodubelekopo.weebly.com/uploads/1/3/4/3/134356924/0db32da89f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414161/normal_606e51be335f5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zuwukab.rf.gd/titeluki.pdfIn PDF document text
    • http://xokesuluz.epizy.com/basic_english_grammar_book_saddleback.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/android_x86_vmware_install.pdfIn PDF document text
    • http://gegawuwiru.epizy.com/70888583710.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/what_is_a_power_structure_in_an_organization.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/book_designing_your_life.pdfIn PDF document text
    • http://latisikonif.epizy.com/drastic_3ds_emulator_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/93902347888.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/25855872911.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/92051995055.pdfIn PDF document text
    • http://sorufemizifolug.rf.gd/sorezomi.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_off0000f4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E9 5312 bytes
SHA-256: f7cb9b7c5f1632896bc17246c16003116b5ba20093d0ce0f49d23a071cc302f2
font_01_sfnt_off0001070e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070E 10504 bytes
SHA-256: ae3b86ebd0f12f668d87a1040f4a85b4f8731318a5bc9e7608368f4e45f82311

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