Malicious PDF — malware analysis report

Static analysis result for SHA-256 e28ae3f16e608d72…

MALICIOUS

PDF

76.2 KB Created: 2021-06-09 08:14:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7f89b7c2da361bc9c1e30811205b830e SHA-1: c572aa57ffa8463dd33f23a352f1414d6cd032a9 SHA-256: e28ae3f16e608d722782acee8b652203ef81f856b535c65099951f8abc4aee17
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://coretry.ru/pbw?utm_term=free+latest+movies+download+websites PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409102/normal_5fc8aca641c76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428052/normal_600a9a4dcef0f.pdfIn PDF document text
    • https://kifewuwumezoduk.weebly.com/uploads/1/3/4/7/134740170/japobejepeji_rotuselawiji_vemafozujoxu.pdfIn PDF document text
    • https://guzozexuvuro.weebly.com/uploads/1/3/4/3/134322735/dupozalo.pdfIn PDF document text
    • https://kabokikofonesa.weebly.com/uploads/1/3/1/6/131637300/ac71a726c77c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386613/normal_5ff811efbdc0d.pdfIn PDF document text
    • https://vigegenatiborig.weebly.com/uploads/1/3/0/7/130740049/5130052.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4365652/normal_60b00b7a20055.pdfIn PDF document text
    • https://zobuxojakaxux.weebly.com/uploads/1/3/4/6/134690110/xidifawukijo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_605334f7ae84c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476011/normal_605c5263e4eda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448718/normal_602734f526b30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384323/normal_60513f30ccc7f.pdfIn PDF document text
    • https://porexogu.weebly.com/uploads/1/3/0/7/130775034/tutalikemo_napizejetux.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
    • http://dijakezepo.pbworks.com/w/file/fetch/144722232/q_significa_la_palabra_avaricia_en_la_biblia.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/39410080858.pdfIn PDF document text
    • http://veniwusuj.pbworks.com/w/file/fetch/144487455/how_long_is_a_plumbing_certificate_valid_for.pdfIn PDF document text
    • http://ganosidil.pbworks.com/w/file/fetch/144456219/43368231640.pdfIn PDF document text
    • http://katafuzum.pbworks.com/w/file/fetch/144618450/zaguginiwima.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F7 5004 bytes
SHA-256: 660d0f9a1ce0d4d1f8a642bb6639f06ced9009d9142431a771673afbdfded927
font_01_sfnt_off0000f1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 10400 bytes
SHA-256: bd2104ff2bcaf9c01fbf6987d6cd2f720d404c1e524e7c2c2c8dc942ee7624b0
font_02_sfnt_off0001157e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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