Malicious PDF — malware analysis report

Static analysis result for SHA-256 34b566fd5d18ec3f…

MALICIOUS

PDF

79.7 KB Created: 2021-04-01 03:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: dbffcc4568c29788c49fb39e3ec73a78 SHA-1: fa9964ff58f0953331d64eac454cdab8b74084e7 SHA-256: 34b566fd5d18ec3ff24d43656ec57f40541bd53c82c4938b1ee101b207cf976d
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 0.9998

Heuristics 6

  • 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.
  • 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://leonvi.ru/award?keyword=mathematics+of+computation+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375708/normal_5ff1412f685d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379486/normal_5fe5a3006ad05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368219/normal_5fe16c02e8f51.pdfIn PDF document text
    • https://junimadegerozo.weebly.com/uploads/1/3/4/0/134096607/naziponuloranomaxox.pdfIn PDF document text
    • https://daguvosiliwu.weebly.com/uploads/1/3/1/4/131406153/moxafotoxe-fapojudimuxete-jawifu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450242/normal_60357d6badb5b.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://zixukomafopu.iblogger.org/luzixajajudi.pdfIn PDF document text
    • https://serirufudo.weebly.com/uploads/1/3/4/7/134712976/9697709.pdfIn PDF document text
    • http://checkmycredit.info/zabulixovawawaqmnp5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407085/normal_60383193980f9.pdfIn PDF document text
    • https://xiliperudal.weebly.com/uploads/1/3/3/9/133999468/2796617.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_9276512948294a5f908d9139943f1a97.pdf?index=trueIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_c36304dbb0f14c13b3717395137fdade.pdf?index=trueIn PDF document text
    • http://bazusokilole.rf.gd/anganwadi_online_form_2019_faridabad.pdfIn PDF document text
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_66e7815846604a689d1a996de3106884.pdf?index=trueIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_2777c9a59f394355988ded66fbb21a0e.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF932 5272 bytes
SHA-256: 3b83ff6b542a2a13a73002310b708ca8eac36b5760eaa3f0ceb44202ae3628b4
font_01_sfnt_off00010b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0F 11112 bytes
SHA-256: 38dbd0f7ea8fa7304f797ae5d102e4cf8306b9f555a5a6062311ff70c500ad79

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