Malicious PDF — malware analysis report

Static analysis result for SHA-256 55528ba8886e8a75…

MALICIOUS

PDF

74.8 KB Created: 2021-03-13 17:23:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 559ad0afdc51302cee36e89ee9bd1bd5 SHA-1: 974af5db1d45e4507991b8d569afcef7f5d149dc SHA-256: 55528ba8886e8a751e11cd4ca18b9413d4cd56d85524a4fe2003396332eaf048
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://gimoguvi.ru/wix?keyword=pto+meeting+agenda PDF link annotation
    • https://cdn.sqhk.co/lukedivibeb/LIRRThb/45957036818.pdfIn PDF document text
    • https://cdn.sqhk.co/vagekoxes/c2qigii/68764461919.pdfIn PDF document text
    • https://cdn.sqhk.co/worekoxe/luhbhap/neighborhood_market_pharmacy_farmington_ar.pdfIn PDF document text
    • https://jukovuwivoxufab.weebly.com/uploads/1/3/3/9/133997180/xaminevexiwevutosi.pdfIn PDF document text
    • https://laregupofonel.weebly.com/uploads/1/3/4/4/134464195/9b170b4b545299.pdfIn PDF document text
    • https://xojurumute.weebly.com/uploads/1/3/5/3/135328527/kipipagokuge.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/mjjnQhc/35548944784.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/hjhgigH/dark_side_lyrics_kelly.pdfIn PDF document text
    • https://sipovabamekejo.weebly.com/uploads/1/3/5/3/135391609/3195446.pdfIn PDF document text
    • https://fezagexagowib.weebly.com/uploads/1/3/5/3/135313062/limikinesab_riwisigude_tujoxeme_kewokibiworupu.pdfIn PDF document text
    • https://wudujadulaneg.weebly.com/uploads/1/3/0/7/130738887/vanex.pdfIn PDF document text
    • https://cdn.sqhk.co/moviferu/jOjjja7/jolted_definition_computer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/78257fd4-3a6f-4f73-982f-a12713a59ac0/wilatadaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/wupagivoz/janemadozapubupofi.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/40067129110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97924fdd-e298-4301-8540-95ade780f7c1/gofugij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e676370-73c3-44ca-bd9f-65ed17e4db53/sufakevisinomez.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/56912151929.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/54217375958.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_off0000e931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE931 4840 bytes
SHA-256: 088a979af43102cd17a1ceb24ed415decfb4e48bdfb4e3980434f1d0f2712efb
font_01_sfnt_off0000f998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF998 10712 bytes
SHA-256: 36fa5949baae24e6de2a380112bba3990843e08fe3fe0c82e0ad8ce59847c034

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