Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd66c012a41eea87…

MALICIOUS

PDF

95.0 KB Created: 2021-03-25 09:54:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 9a96289578336410378380637b3eaabf SHA-1: 5288962614b65610e04053ded819c09f57b78f51 SHA-256: cd66c012a41eea877cffff84056ace12a87ae6f3ab5c8fdafddbed9ef9bfb5fe
194 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. It uses an invoice-themed lure. 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 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://baarspo.ru/wix?keyword=city+siege+3+hacked+unblocked PDF link annotation
    • https://tazowodogakog.weebly.com/uploads/1/3/1/4/131437711/f59c2b0.pdfIn PDF document text
    • https://vunozeguwogiwe.weebly.com/uploads/1/3/4/7/134745761/6992940.pdfIn PDF document text
    • https://walamezer.weebly.com/uploads/1/3/0/7/130740591/xaditirepora.pdfIn PDF document text
    • https://japapetokanov.weebly.com/uploads/1/3/1/4/131454126/lalas.pdfIn PDF document text
    • http://vowujebotoza.mywebcommunity.org/zizunirewaligozivema.pdfIn PDF document text
    • http://bukuminuwakub.mypressonline.com/xikarimijodulikor.pdfIn PDF document text
    • http://tujijamutibe.sportsontheweb.net/are_amana_dishwashers_good.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/686ad9a6-34bc-409d-956f-52d6b1927a58/josodopajapafevogifewugek.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/33587550576.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/febasojanebises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aac168e-79ac-4791-bca7-b0812113483c/sample_employee_self_assessment_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb440acb-445f-4237-b3d9-8dc6d0fcc2c7/faxukuwetujepojesofak.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/definicion_de_enlace_ionico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/973c9c43-13be-41d9-b8c3-d6589400f209/sofawuzexizetetomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2274e524-1a09-497d-a70f-0f17a902c555/xuvupifuvefi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5868d740-e6ce-4f19-b001-ad87c3d553ff/le_petit_prince_chapitre_16_resume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69e78b66-5e3a-46ec-b3e8-2e0539f5cea2/mozasuvewonewa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10e1db03-44c1-4c79-a4df-dd8040d19008/daderunamoni.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_off000131c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C6 5480 bytes
SHA-256: ab6a928f64ce0ada1d104631c4150a75d0e90fd01974f63aa2487567512d729a
font_01_sfnt_off00014469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14469 12356 bytes
SHA-256: 5e1f6bd92aa4d335b12311391b9880a4925b5ed77e66a9a7260502361491c382

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